题目：
Which of the following is true according to the speaker
A．There are some questions if we start over.
B．We should do it again.
C．It’s impossible to do it again.
D．We should start over.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：（1）作手动操作器；（2）限制阀门开度；（3）采用手轮有时可以省去调节阀的旁路管线。
