问题
单项选择题
起升机构起升速度误差不大于（）%。
A.4
B.5
C.6
D.10
答案
参考答案：B
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起升机构起升速度误差不大于（）%。
A.4
B.5
C.6
D.10
参考答案：B
| 读一读下列问题，从方框中选择正确的答句。 | |
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