问题
单项选择题
适用于壳程介质清洁，不易结垢、管程需清洗以及温差不打或者温差虽大但壳程压力不高的换热器有（）
A、固定管板式换热器
B、浮头式换热器
C、U形管式换热器
D、填料函式热水器
答案
参考答案：A
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适用于壳程介质清洁，不易结垢、管程需清洗以及温差不打或者温差虽大但壳程压力不高的换热器有（）
A、固定管板式换热器
B、浮头式换热器
C、U形管式换热器
D、填料函式热水器
参考答案：A
完形填空。
Mike is a little boy. He 1 four years old. One day, his mother 2 him to see his grandmother.
His grandmother's home is very far 3 their house. So they go there 4 . There 5 only a few people
on the bus. They all sit on 6 seats. Mike is very happy. He looks 7 the window and talks with his
mother. After a while, Mike starts running on the bus. He runs and runs, " 8 are you always running?
Please sit 9 ," his mother says. "I want to see my grandmother 10 . I want the bus to move faster."
Mike answers.
| ( )1. A. has | |
| ( )2. A. takes | |
| ( )3. A. from | |
| ( )4. A. by train | |
| ( )5. A. is | |
| ( )6. A. they | |
| ( )7. A. out of | |
| ( )8. A. What | |
| ( )9. A. in | |
| ( )10.A. faster | |
| B. have |
B. makes
B. off
B. with a bus
B. have
B. their
B. out
B. How
B. down
B. later
C. lets
C. to
C. by bus
C. are
C. theirs
C. from
C. Why
C. up
C. earlier