单项选择题
If you （） the equipment more carefully before sail, we （） so much trouble now.
A.examined；are not having
B.had examined；would not have
C.had examined；would not have had
D.should examine；would not have
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We’ve tried many ways, but all in vainOnly in this way, （） the problem, I’m sure.
A.can we solve
B.we can solve
C.we will solve
D.can we solved -
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Let H （） the quantity of heat which has been converted into mechanical work.
A.represent
B.represents
C.representing
D.being represented -
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The chief engineer suggests that the second engineer （） a dead line for handing in the work plan.
A.will set
B.shall set
C.set
D.sets
