问题
问答题 简答题
往复压缩机气阀有何作用？
答案
参考答案：
吸气阀和排气阀的主要作用是间歇地按时使气缸工作室和压缩机的吸气管及排气管连通或隔开，从而达到将气体吸入气缸并将气体从气缸里排出去的目的。
工作时只能使气体单向流动，而不能倒向返回，具有止逆阀的功用。
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往复压缩机气阀有何作用？
参考答案：
吸气阀和排气阀的主要作用是间歇地按时使气缸工作室和压缩机的吸气管及排气管连通或隔开，从而达到将气体吸入气缸并将气体从气缸里排出去的目的。
工作时只能使气体单向流动，而不能倒向返回，具有止逆阀的功用。
It amazed me—every time I saw Joe，he was smiling.It didn’t ____ whether he had to stop at a stop light，or if he were the seventh person in ____ at the bank，and the service stopped just before he got there.Joe ___ smiled.It made me wonder why he seemed so ____ every day. Having observed Joe with other people，I ____ something else also.Joe asked people how they were doing，and really seemed to listen to their ____.If someone were hurting，he had __7__ for him and kind words，and offered to ____ in any way he could. It made me think...What if I tried to smile more？A(n) ____ of sorts began when I went to the grocery store.I smiled as I went up and down the aisles...and people I didn’t even ___ smiled back at me.Some even ____！The little kid in the cart(购物车) who was giving his mother a ____ time saw me smile and ____ talking...and，you guessed it.He made a shy little attempt at a smile.The man in the handicapped(残疾的) cart ____ a person to reach something...I could get that for him.The smile even transferred over to him，and he ____me. As I drove home，I was smiling.I ____ what I had just learned，and when someone passed me and gave me a(n) ____，I smiled at him.He looked puzzled. Now I know a smile is a small thing，but what if we were all to try to smile a few more times each day？I couldn’t believe how ___ I felt.Nothing in my life had changed，____ maybe it had.For what I learned was that such a small thing could ____ not only my spirits，but those around me as well.
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