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问题 单项选择题

流量计量标准装置中使用的闭式液流换向器无液流飞溅产生的误差，压损（），在隔板动作时管道内流量（）.

A.大；变化

B.大；稳定

C.小；变化

D.小；稳定

答案

参考答案：A

单项选择题 B型题

直接化学发光免疫分析采用什么物质标记抗体（抗原）（）

A.三联吡啶钌

B.碱性磷酸酶

C.三丙胺

D.鲁米诺

E.吖啶酯
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句型转换

完成句子，使改写后的句子完整，并与原句的意思相符，每个空格只准填一个单词。

1．It will be quite a windy day tomorrow. 

                                be a                           tomorrow.

2．There is something wrong with the computer now.

      The computer                          now.

3．People in the US can't drink beer or wine before they reach 21. 

      People younger than 21                                                      drink beer or wine.

4．Have you found the missing necklace?

      Have you found the necklace                           missing?

5．I'm going to make an early start so that I will catch the first train.

      I'm going to                                                     the first train.

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