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單項(xiàng)選擇題

Convection is the principal means （） temperature is equilibrated in liquids and gases.

A.in which
B.on which
C.by which
D.from which

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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