问题
单项选择题
对于用2根钢丝绳的曳引驱动电梯，钢丝绳的安全系数不应小于（）。
A.10
B.12
C.16
D.20
答案
参考答案：C
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对于用2根钢丝绳的曳引驱动电梯，钢丝绳的安全系数不应小于（）。
A.10
B.12
C.16
D.20
参考答案：C
| 完形填空 | ||||
| Manners are important to happy relations among people. No one 1 a person with bad manners. A 2 with good manners never laughs at people when they are in trouble. Instead, he 3 to help them. When he asks for something, he says " 4 ". And when he receives something, he 5 says "Thank you". He does not interrupt (打扰) 6 people when they are talking, He does not talk loudly or laugh loudly 7 public. When he sneezes or spits(吐痰) , he uses a 8 . If he is late, he 9 make an apology to the teacher either at the time 10 after class. | ||||
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