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问题 单项选择题

理想的HPLC用水应为（）的超纯水并通过0.22um的滤膜除去热源、有机物、无机离子及空气等。

A、18.2Ω

B、16.5Ω

C、20.0Ω

D、18.5Ω

答案

参考答案：A

填空题

People sing the national anthem in（）
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单项选择题

Sometimes we have specific problems with our mother; sometimes, life with her can just be hard work. If there are difficulties in your (1) , it’s best to deal with them, (2) remember that any (3) should be done (4) person or by letter. The telephone is not a good (5) because it is too easy (6) either side to (7) the conversation.

Explain to her (8) you find difficult in your relationship and then (9) some new arrangements that you think would establish a (10) balance between you. Sometimes we hold (11) from establishing such boundaries because we are afraid that doing (12) implies we are (13) her. We need to remember that being (14) from our mother does not (15) mean that we no longer love her. If the conflict is (16) and you cannot find a way to (17) it, you might decide to give up your relationship with your mother for a while. Some of my patients had (18) "trial separations". The (19) allowed things to simmer down, enabling (20) .

6（）

A.on

B.for

C.off

D.to
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