单项选择题
A.resistance B.weight C.speed D.displacement
Radar is not only to obtain（）,but also to measure their...
单项选择题Radar is not only to obtain（）,but also to measure their distance away from you.
A.brightness of obtain B.color of targets C.shape of targets D.bearing of objects
The anchor was then（）and the siren sounded.A.aweighB.we...
单项选择题The anchor was then（）and the siren sounded.
A.aweigh B.weight C.weigh D.weighing
Are there many（）and warehouses in the port?A.wharfB.wha...
单项选择题Are there many（）and warehouses in the port?
A.wharf B.wharves C.wharve D.wharfs
