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问题
单项选择题
钢丝绳连接装置，经2倍于其最大静荷重的拉力试验，裂纹或永久伸长量超过（）％，不得使用。
A、0.1
B、0.2
C、0.3
答案
参考答案：B
解答题
2x-7×2=8
x+3x=3.2×4
3
4
-
1
6
x=
1
3
12：x=28：2．
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选择题
— How about ______ in the river with us?
— Sorry I can't. My parents often tell me ______ that.
A.swim, don't do
B. swim, to do
C. swimming, not do
D. swimming, not to do
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