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机泵巡检的主要容是,循环水及各种冲洗管线是否畅通、机封是否泄漏、机泵的声音、振动和出口压力是否正常（）

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Directions:In this section you will hear a recorded short passage.The passage is printed in the test paper, but with some words or phrases missing. The passage will be read two times. You are required

为公司提供检验、试验和校准服务的外部实验室必须通过ISO/IEC17025或等效的国家标准认可。

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Directions:This section is to test your ability to understand short conversations. There are 2 recorded conversations in it. After each conversation, there are some recorded questions.Both the convers

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