A.keep
B.to keep
C.be kept
D.to be kept
[单选题]The instrumental panel of the generator must( )clean every day.A.keepB.to k
[单选题]The windows of our office ______ every day.A.is cleanedB.are cleanedC.are c
[单选题]We find it _____ to do morning exercises every day.A.helpfulB.thankfulC.won
[问答题]I take a walk in the early morning every day.
[单选题]It’s( )for us to have physical exercises every day.A.goodB.kindC.gracefulD.
[单选题]What is an advantage of a steam turbine over a diesel for the main propulsion?()A . Faster response from ahead to asternB . Less fuel consumptionC . Cheaper initial installation costD . Less weight per unit of horsepower
[单选题]I [stroll] aroundthe park for an hour after dinner every day.A.runB.rollC.w
[单选题]The steam turbine parameters should match with that of the( )A.gas turbineB
[问答题]As we all know, hundreds of children in Africa lose their young lives every
[单选题]The power generated in the turbine must () that required by the compressor.A . be less thanB . be larger thanC . be as large asD . not be so large a