單項(xiàng)選擇題A vessel traveling down a narrow channel，especially if the draft is nearly equal to the depth of the water，may set off the nearer side. This effect is known as（）.

A.smelling the bottom
B.squatting
C.bank suction
D.bank cushion


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1.單項(xiàng)選擇題A vessel towing astern in an operation which severely restricts the towing vessel and her tow in their ability to change course shall，when making way，exhibit（）.

A.the masthead lights for a towing vessel
B.the lights for a vessel restricted in its ability to maneuver
C.sidelights，stern light and towing light
D.All of the above

2.單項(xiàng)選擇題A vessel towing a barge astern would show，at the stern（）.

A.only a stern light
B.a towing light above the stern light
C.two towing lights in a vertical line
D.two white lights in a vertical line

3.單項(xiàng)選擇題A vessel sighting a northern right whale dead ahead should（）.

A.maintain course and speed
B.alter course to give a wide clearance
C.report the whale's position to the Canadian Coast Guard
D.All of the above

4.單項(xiàng)選擇題A vessel showing a rigid replica of the International Code flag “A” is engaged in（）.

A.diving operations
B.dredging
C.fishing
D.mineclearance operations

5.單項(xiàng)選擇題A vessel showing a green light over a white light in a vertical line above the level of the sidelights is（）.

A.engaged in underwater construction
B.under sail and power
C.a pilot vessel
D.trawling