问题
单项选择题
在锅炉安装中，有关压力表说法中错误的是( )。
A．当锅炉工作压力＜2.5MPa表压时，压力表精确度不应低于1.5级
B．压力表盘直径不得小于100mm
C．表盘刻度极限值应为工作压力的1.5～3.0倍
D．表盘刻度极限值最好选用2.5倍工作压力
答案
参考答案：D
搜题请搜索小程序“爱下问搜题”
在锅炉安装中，有关压力表说法中错误的是( )。
A．当锅炉工作压力＜2.5MPa表压时，压力表精确度不应低于1.5级
B．压力表盘直径不得小于100mm
C．表盘刻度极限值应为工作压力的1.5～3.0倍
D．表盘刻度极限值最好选用2.5倍工作压力
参考答案：D
| 阅读理解。 | ||||||||
Look at the bulletin board (公告栏) of Class 3B.
| ||||||||
| 1. Elsa wants to _____. | ||||||||
| A. find a cute cat B. buy a good house C. find a new home for a cat D. make friends with someone who has a cat | ||||||||
| 2. Mr Jones will teach the students _____ in his talk. | ||||||||
| A. how to drive a car B. how to take music notes C. how to learn lessons well D. how to be safe on the road | ||||||||
| 3. Mr Jones' talk lasts _____. | ||||||||
| A. half an hour B. one hour C. two hours D. three hours | ||||||||
| 4. Tony wants to buy the new notebook from Jack. He should pay _____. | ||||||||
| A. $2 B. $3 C. $5 D. $17 | ||||||||
| 5. David lost his wallet on January 5. What should he do? | ||||||||
| A. Go to the gym at once. B. Ask Ms Chang about that. C. Meet Jack in the music class. D. Wait at the front door of the classroom. |
