Mariners should ensure correct（）of aids to navigation during

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！

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

On discovery of new dangers, of changes or defects in aids to navigation, Masters of vessels should immediately inform ______.

A.their government

B.their port of registry

C.British Government

D.Hydrographer of the Navy of Ministry of Defense of U.K

The information on ______ is not likely found in The Mariners Handbook（NP100）．

A.IALA Buoyage system

B.hydrography，topography，navigational aids and their services

C.basic meteorology and navigation in ice and hazards and restrictions to navigation

D.information on tides，currents and characteristics of the sea

No damage of any kind ______ aids to navigation or navigation facilities．

A.should be done to

B.should not be done to

C.must be done with

D.must not be done with

______ amplify charted detail and contain information needed for safe navigation．

A.Admiralty Sailing Directions

B.Admiralty List of Lights

C.Admiralty List of Signals

D.Admiralty Notices to Mariners

The issue of Notices to Mariners of charts and these aids(Radar beacons)may be delayed until such time as they are assessed to be ______.

A.temporary

B.permanent

C.occasional

D.steady

Vessels should be manned ________duly qualified offcers and crew adequate________ensure the safety of navigation.

A.by/to

B.with/to

C.with/for

D.from/for

Before sailing，mariners on duty shall check the headings of magnetic compass by comparison with ______.

A.ship's clock

B.engine movement recorder

C.repeaters

D.navigation lights

The operation of which aids to navigation may be suspended during war or national emergency ________．

A.Navigational satellites

B.Loran

C.Omega

D.Any of the above