问题
多项选择题
振动测量仪表：传感器的信号线应为屏蔽线，屏蔽线应（）。
A、连续
B、绝缘
C、单点接地
D、防火
答案
参考答案：A, B, C
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振动测量仪表：传感器的信号线应为屏蔽线，屏蔽线应（）。
A、连续
B、绝缘
C、单点接地
D、防火
参考答案：A, B, C
| 短文填空。用方框中所给词的适当形式填空。 | |
of teenagers. They feel 2 because they have too much homework to do both at school and at home. They have lots of exams 3 . And parents usually send them to different classes at weekends. They don't have their 4 time to do what they are 5 in. Now more and more teenagers are getting short-sighted(近视). They often read in bed or keep 6 for a long time 7 having a rest. Some of them are crazy about 8_ computer games. Some spend too much time watching TV. Another serious problem among teenagers is that many of them are becoming fat. They eat too much junk food but they take 9_exercise. I think teenagers should think of ways to 10 with the problems. They should make a plan for study and hobbies and find time to relax as much as possible. |