Geographical positions outlining the area of the sector
True bearings as observed from the ship toward the light
An outline of the area of the sector
True bearings as observed from the light toward the ship
第1题：
The safety signal used on the marine radiotelephone：Ⅰ．Consists of three repetitions of the word PAN transmitted before the call sign and name of the calling station．Ⅱ．Indicates a message concerning the safety of navigation or meteorological warnings．
A.Ⅰonly
B.Ⅱonly
C.Both Ⅰand Ⅱ
D.Neither Ⅰnor Ⅱ
第2题：
Mariners are FIRST warned of serious defects or important changes to aids to navigation by means of ______.
A.marine broadcast Notice to Mariners
B.Weekly Notices to Mariners
C.corrected editions of charts
D.Light Lists
第3题：
Red sectors of navigation lights warn mariners of ______.
A.floating debris
B.heavily trafficked areas
C.recently sunken vessels
D.shoals or nearby land
第4题：
In marine navigation，______is a place where a ship anchors or may anchor．
A.Fairway
B.Channel
C.Separation zone
D.Roadstead
第5题：
A vessel not under command shall display ______.
A.two red lights at night and two black balls during daylight
B.two red lights at night and three black balls during daylight
C.three red lights at night and two black balls during daylight
D.three red lights at night and three black balls during daylight
第6题：
材料：Navigation in the canal
It is not recommended that any person shall be allowed on the bridge or in the pilot house except the pilot and other representative of the Canal，and Master and such officers and other members of the crew of the vessel as may be necessary for its navigation and control，management，operation and safety．
Navigational aids are difficult to maintain and are reported to be unreliable in this waters．A considerable amount of shipping uses the canal and，in addition，many local fishing craft with nets may be encountered in the area.Since passage through the canal entails a run of more than 250 miles，long periods of considerable vigilance are necessary in order to maintain safe standards of navigation．
问题：PILOT HOUSE is referred to ______ in this passage．
A.the cabin in which the pilot stays
B.the space in which the rudder is located
C.the bridge of vessels
D.the cabin which is prepared for the pilot
SHIPPING is referred to ______ in this passage．A.he operations of transportation of goods by sea
B.the procedures of marine transportation business
C.the management of marine transportation business
D.the vessels and ships
The author implies that ______ ．A.even by making use of modern instrument it is difficult to maintain safety in this area
B.mariners should take it easy when navigating in this area
C.modern instrument should be used to control the safety of navigation in this area
D.it is dangerous when navigating in this area
The person on the bridge or in the pilot house shall be those ______ ．A.who are recommended
B.who are familiar with the navigation，management，operation and safety control
C.who are directly involved in the navigation，management，operation and safety control
D.who have nothing to do with the navigation，management，operation and safety control
请帮忙给出每个问题的正确答案和分析，谢谢！
第7题：
A vessel not under command making way at night would show ______.
A.two all-round red lights in a vertical line
B.anchor lights and sidelights
C.two all-round white lights in a vertical line，sidelights and a stern light
D.two all-round red lights in a vertical line，sidelights，and a stern light
第8题：
Restricted areas at locks and dams are indicated by ______.
A.flashing red lights upstream and fixed red lights downstrem
B.yellow unlighted buoys
C.signs and / or flashing red lights
D.red daymarks upstream and green daymarks downstream
第9题：
材料：
It is not recommended that any person shall be allowed on the bridge or in the pilot house except the pilot and other representative of the canal，and master and such officers and other members of the crew of the vessel as may be necessary for its navigation and control，management，operation and safety．
Navigational aids are difficult to maintain and are reported to be unreliable in this waters．A considerable amount of shipping uses the canal and，in addition，many local fishing craft with nets may be encountered in the area. Since passage through the canal entails a run of more than 250 miles，long periods of considerable vigilance are necessary in order to maintain safe standards of navigation．
问题：
PILOT HOUSE is referred to ________ in this passage．
A.the cabin in which the pilot stays
B.the space which the rudder is located
C.the bridge of vessels
D.the cabin which is prepared for the pilot
SHIPPING is referred ________ in this passage．A.the operations of transportation of GOODs by sea
B.the procedures of marine transportation business
C.the management of marine transportation business
D.the vessels and ships
The person on the bridge or in the pilot house shall be those ________．A.who are recommended
B.who are familiar with the navigation．management．Operation and safety control
C.who are directly involved in the navigation，management，operation and safety control
D.who have nothing to do with the navigation，management，operation and safety control
The author implies that ________．A.even by making use of modern instrument it is difficult to maintain safety in this area
B.mariners should take it easy when navigating in this area
C.modern instrument should be used to control the safety of navigation in this area
D.it is dangerous when navigating in this area
请帮忙给出每个问题的正确答案和分析，谢谢！
第10题：
control the back pressure of return oil
lock the oil lines under some conditions
change the direction of oil flow
act as relief valve