If you pour oil on water, it_________float. A. shall B. will C. can D. may

If found oil when we open low oil level plug of separator, it indicates ____.

If oil density were greater than water’s, the oil separator _____.A.did workB.would work w

The snakes will attack only if you take it ______ surprise.A．inB．byC．withD．on

The ______ was that, if you had to abandon ship and had time to put on a dry suit, it woul

If in doubt as to the true water level when a boiler is being oil－fired, you should _____.

A centrifugal fuel oil purifier should be shut down if ________.A.more sealing water is ne