单项选择题

（）on still water indictes how loading weight distribution affects on longitudinal strength.

A.Bending moment
B.local strength
C.shear force
D.displacement

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单项选择题

A.foul of anchor
B.dropping anchor
C.weighing anchor
D.walking back anchor

单项选择题

A.The marine sextant
B.The chronometer
C.The echo sounder
D.The radar

单项选择题

A.are tracked on reciprocal bearings
B.are tracked at the same range
C.are tracked on the same bearing
D.pass closely to each other