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【单选题】
柴油机不能启动和工作，即使启动起来，柴油机运转也无力，转速不能提高，很可能是由（）引起的。A.
喷油泵供油量多
B.
喷油泵不供油或供油量少
C.
机油压力过低
D.
冷却水温不高
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【单选题】听力原文：M: I'm so tired that I can't see straight. W: You've been tired a lot lately, haven't you? M: Well, for the last few weeks, I've had to stay up most the nights to observe star configurations for ...
A.
Find his glasses.
B.
Sit up straight.
C.
Get enough rest.
D.
Change his tires.
【单选题】--- Hi, Grandma, why do you look so tired? --- I’m tired. I _______ the cleaning all morning.
A.
did
B.
had done
C.
have been doing
D.
have done
【单选题】电气化铁路线路拨道,线路中心位移不得超过()mm;一侧拨道量年度累计不得大于120mm,并不得侵入限界(中级线路工用)。
A.
±15
B.
±30
C.
±45
D.
±70
【单选题】听力原文：M: What trouble are you having with your eyes? W: Well, I'm a bit tired and you know I do a lot of reading because of my work and besides our room is in the basement in the Department of English ...
A.
She has a lot of reading assignment.
B.
Her room is not well lit.
C.
The English Department is in a basement.
D.
She lives in a basement and works hard.
【单选题】电气化铁路线路拨道，线路中心位移不得超过（ ）mm；一侧拨道量年度累计不得大于120mm，并不得侵入限界。
A.
± 15
B.
± 30
C.
± 45
D.
± 70
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