问题
单项选择题
液压电梯各机械、液压及电器设备在正常工作时不得有撞击声和异常响声.乘客电梯（包括观光梯）和病床电梯的机房噪声不得大于(）.运行中轿厢内噪声不得大于（）&nB.sp;.开关门过程噪声不得大于（）.
A.85DB；55DB；65DB
B.85DB；65DB；75DB
答案
参考答案：A
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液压电梯各机械、液压及电器设备在正常工作时不得有撞击声和异常响声.乘客电梯（包括观光梯）和病床电梯的机房噪声不得大于(）.运行中轿厢内噪声不得大于（）&nB.sp;.开关门过程噪声不得大于（）.
A.85DB；55DB；65DB
B.85DB；65DB；75DB
参考答案：A
| 选择正确答案，完成下列短文。 |
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