单项选择题
A.Bending moment B.local strength C.shear force D.displacement
ANCHOR HAS ITS OWN CABLE TWISTED AROUND IT defines（）.A....
单项选择题ANCHOR HAS ITS OWN CABLE TWISTED AROUND IT defines（）.
A.foul of anchor B.dropping anchor C.weighing anchor D.walking back anchor
（）sends a radio signal from the bottom of the ship to t...
单项选择题（）sends a radio signal from the bottom of the ship to the sea-bed,from which it is reflected.
A.The marine sextant B.The chronometer C.The echo sounder D.The radar
The ARPA may swap targets when automatically tracking i...
单项选择题The ARPA may swap targets when automatically tracking if two targets（）
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
