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單項選擇題

The exhaust gases for a new engine should be （） when the engine operates under full load.

A.smoky
B.a little bit dense
C.visible
D.almost invisible

單項選擇題

The engine will fail to start unless （）.

A.the pressure of the starting air is high enough
B.there is enough air in the air reservoirs
C.the air is supplied into the cylinders in the appropriate sequence
D.all of the above

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The external circumference of a pair of main bearing shells is slightly （） that of the bore of the housing which receives them Whats the meaning of “that” in the sentence above？

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The exhaust gases for a new engine should be （） when the engine operates under full load.

The engine will fail to start unless （）.

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The external circumference of a pair of main bearing shells is slightly （） that of the bore of the housing which receives them Whats the meaning of “that” in the sentence above？