單項選擇題（）, the motion would continue indefinitely once it had started.

A.Were there loss of energy by friction
B.Since there be loss of energy by friction
C.Were there no loss of energy by friction
D.Should be no loss of energy by friction


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1.單項選擇題（） the bodies are, （） the friction will be.

A.The smoother；the greater
B.Smoother；less
C.The rougher；the greater
D.rougher；greater

2.單項選擇題Convection is the principal means （） temperature is equilibrated in liquids and gases.

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

3.單項選擇題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

4.單項選擇題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

5.單項選擇題Let H （） the quantity of heat which has been converted into mechanical work.

A.represent
B.represents
C.representing
D.being represented