單項選擇題The certificate for the refrigerating plant will（）soonI’d like to extend its validation now.

A.update
B.finish
C.outdated
D.expire


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1.單項選擇題（）, remedies must be taken to stop it as early as possible.

A.Any surge occurs
B.Any surge occurred
C.Should any surge occur
D.Should any surge occurring

2.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

3.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

4.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

5.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