题目内容

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

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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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