试题与答案

管道中使用的法兰有哪几种?

题型:问答题 简答题

题目:

管道中使用的法兰有哪几种?

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B, C, D

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We're in the same (同一个)class, Class One. Look! This is her picture. She has

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1. What's Frank's Chinese name?

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