问题
单项选择题
气囊式蓄能器中充气压力应不小于管路最小工作压力的（）。
A.75%
B.80%
C.85%
D.90%
答案
参考答案：D
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气囊式蓄能器中充气压力应不小于管路最小工作压力的（）。
A.75%
B.80%
C.85%
D.90%
参考答案：D
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| ( )1. We are relaxing at the good news. A B C ( )2. Spending time with family are very fun. A B C ( )3. We don't visit friends without call first. A B C ( )4. It's important of you to learn English well. A B C ( )5. You are suppose to come a little earlier. A B C | _________ _________ _________ _________ _________ |