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【单选题】
为了保证柴油机可靠起动,在压缩空气起动系统中,气缸起动阀开启定时的一般规律是——。A.
低速机比高速机晚
B.
低速机比高速机早
C.
低速机与高速机相同
D.
没有规律
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反馈参考答案：
举一反三
【单选题】有关上消化道大出血的说法，正确的是
A.
出血的部位高低是次要的
B.
上消化道大出血的临床表临现取决于出血的速度和部位
C.
一次性出血量800ml，占循环量的20％，可出现休克
D.
胃十二指肠溃疡出血占50％
E.
以上都正确
【单选题】According to Dr. Getsy, most people who complain of trouble in sleeping are those who
A.
have the disease of chronic insomnia.
B.
don't know the importance of sleep.
C.
exercise less and eat more.
D.
always stay awake in bed.
【简答题】上消化道大出血
【单选题】My teacher takes great trouble ______me learn English, since I have a lot of trouble _____it. [ ]
A.
helping; learning
B.
to help; to learn
C.
helping; to learn
D.
to help; learning
【简答题】I had no trouble in solving this p______.
【单选题】If they ______ what I was saying, they’d know what I was talking about.
A.
took the trouble to listen to
B.
had trouble listening to
C.
take the trouble to listen to
D.
have trouble listening to
【简答题】上消化道大出血概念
【单选题】— What great trouble I have solving this problem now！ —_____ my advice, you ________less trouble.
A.
If you had taken, would have had
B.
If you took, would have
C.
If you had taken, would have
D.
If you take, will have
【单选题】在沉降作用明显的河流充分混合段，对排入河流的化学需氧量(COD)进行水质预测最适宜采用( )。
A.
河流一维水质模式
B.
河流平面二维水质模式
C.
河流完全混合模式
D.
河流S-P模式
【单选题】在沉降作用明显的河流充分混合段，对排入河流的化学需氧量（COD）进行水质预测最适宜釆用（）。
A.
河流一维水质模式
B.
河流平面二维水质模式
C.
河流完全混合模式
D.
河流S-P模式
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