单选题A hand held instrument used to measure distances between objects and the ship is a（）.A vernierB psychrometerC hygrometerD stadimeter

Radar is used not only to look______，but also to measure their distances away from you．

A.at obscured objects

B.forward submerged targets

C.up exposed targets

D.for unseen objects

refers to the parts of the computer that you can ,see and touch. It is used for the purpose of(69).

A．Software

B．Hardware

C．Hardship

D．Instrument

I held the little bird in my hand and felt its heart ( ).

A、striking

B、bumping

C、knocking

D、beating

An immersion suit should be equipped with a/an ______.

A.air bottle for breathing

B.whistle and hand held flare

C.whistle，strobe light and reflective tape

D.whistle，hand held flare and sea dye marker

A hand held instrument used to measure distances between objects and the ship is a ______.

A.vernier

B.psychrometer

C.hygrometer

D.stadimeter

Radar is not only to obtain ________ ，but also to measure their distances away from you．

A.brightness of objects

B.color of targets

C.shape of targets

D.bearings of objects

The term foreign exchange is best defined by the following statement: it is ______.

A．the rate of exchange between two currencies

B．synonymous with currency exchange

C．the place in which foreign currencies are exchanged

D．an instrument such as paper currency, note, and check used to make payments between countries

A sling psychrometer is a(n) ______.

A.type of cargo gear

B.instrument used in celestial navigation

C.instrument used to measure relative humidity

D.instrument used to measure specific gravity

A check line is ______．

A.A safety line attached to a man working over the side

B.Used to measure water depth

C.Used to slow the headway of a barge

D.Used to measure the overhead height of a bridge