A swift current occurring in a narrow passage connecting two large bodies of water,which is produced by the continuously changing difference in height of tide at the two ends of the passage,is called a ______.
A.hydraulic current
B.rectilinear current
C.rotary current
D.harmonic current
第1题:
Which of the following is NOT TRUE in the passage?
A. The two-way radio is like a telephone for Australian farmers.
B. Families on large farms could keep in touch with each other by radios.
C. The two-way radio is like a newspaper for Australian farmers.
D. All the Australians live on dry places, and they use radios in many ways.
此题为三正一误的细节题。不符合事实的是D。
第2题:
There are two areas off the N coast of France,which remain dangerous because of ______.
A.the density of vessel traffic on passage through the strait
B.the fact that the passage through the strait is constricted by a series of narrow banks,running NE-SW
C.mines lied in the war of 1939-1945
D.the strong tidal streams in the strait
第3题:
Find the word in the passage which means “ the movement from one place to another of a large group of animals” and write it down here: __________.
第4题:
第5题:
A ______ is created by a pressure gradient or slope in the water level.
A.gradient current
B.density current
C.swift current
D.torrent current
第6题:
are designed to manage large bodies of information.
A.I/O ports
B.Printers
C.Database system
D.Keyboards
第7题:
All the following is true except that ______.
A.in many places a counter current flows in opposition to the main current close to the bank
B.current can vary with depth of water and large deep draught ships can experience different current effects at differing parts of the hull tend to turn to the wind
C.as speed is reduced,the increased proportion of the ship's vector which is attributable to current will set the ship close to obstructions
D.when close to the berth in a head current,there is a danger that flow inshore of the ship becomes restricted and the ship is subject to interactive forces
第8题:
● (75) are designed to manage large bodies of information.
(75)
A. I/O ports
B. Printers
C. Database system
D. Keyboards
第9题:
The number and position of hydrants arranged on board shall be such that _______,one of which shall be from a single length of hose,may reach any part of the ship normally accessible to the passengers or crew while the ship is being navigated.
A.at least two jets of water which shall be from the same length of hose
B.at least two jets of water emanating from the same hydrant
C.at least two jets of water not emanating from the same hydrant
D.at least two jets of water not emanating from the same hydrant,one of which shall be from a single length of hose
第10题: