题目：
阅读短文，用所给词的正确形式填空。
Li Hong is the only child in her family. She loves her parents, and her parents love her, too. But now
she has some __1__ (trouble). She thinks that her parents don't understand her. She wants to make her
own decisions, but her parents always ask her __2__ (obey) them. For example, Li Hong is good at
__3__ (play) ping-pong and she hopes to be a famous ping-pong player like Deng Yaping in the future,
but her parents think it is difficult for her __4__ (achieve) this dream and she should be realistic. And if she
spends a lot of time __5__ (practice) ping-pong every day, she will fall behind the others in her studies.
Li Hong doesn't know what to do now.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：立柱不能承载是什么原因可能是：安全阀调整值变低；液控单向阀关闭元件损坏或有脏物卡住关闭不严；立柱活塞密封损坏，活塞腔与环形腔窜液；安全阀阀座副损坏有泄露。
