当齿轮泵的结构和转速一定时，其压头与其所在管路特性的关系是（_爱下问搜题

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问题单项选择题

当齿轮泵的结构和转速一定时，其压头与其所在管路特性的关系是（）。

A.无关

B.管路阻力越大，压头越高

C.管路阻力越大，压头越低

D.不好说

答案

参考答案：B

完形填空

完形填空。

Mike:    1   are you going to do this afternoon?
Zhang: I'm    2   to visit my grandparents.
Mike:     3   do you get there?
Zhang: I get there    4   subway.
Mike: Where   5   they live?
Zhang: Their home is next to the Science Bookstore. I turn left   6   the traffic lights
           in front of the subway station, then go straight.   7   home is   8   the left.
Mike: I'm going to the Science Bookstore afternoon! I want   9   buy a new book.
Zhang:  10  go together after lunch.

( )1. A. When
( )2. A. going
( )3. A. What
( )4. A. on
( )5. A. are
( )6. A. in
( )7. A. They
( )8. A. in
( )9. A. to
( )10. A. Let

B. What
B. go
B. When
B. in
B. is
B. on
B. Their
B. on
B. and
B. Let's

C. Do
C. will
C. How
C. by
C. do
C. at
C. His
C. at
C. or
C. I

D. Where
D. shall
D. Where
D. at
D. can
D. to
D. Her
D. of
D. but
D. You

填空题

钨极氩弧焊又称为（）或（）。