單項(xiàng)選擇題You’d better（）your course to port to avoid collision.
A.to alter
B.alter
C.altering
D.altered
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1.單項(xiàng)選擇題Your fireman’s outfit includes a(n)（）.
A.chemical protection face shield
B.approved work vest
C.self-contained breathing apparatus
D.marlinspike
2.單項(xiàng)選擇題Your ship is in shallow water and the bow rides up on its bow wave while the stern sinks into a depression of its transverse wave system. What is this called?（）.
A.Broaching
B.Fish tailing
C.Squatting
D.Parallel sinkage
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