单项选择题
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？
A.less than B.lighter than C.larger than D.smaller than
单项选择题 The exhaust gases for a new engine should be （） when the engine operates under full load.
单项选择题 The engine will fail to start unless （）.
单项选择题 “The engine not obtaining the sufficient speed for firing” means that （）.
