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沉筒式液位计的量程就是沉筒的高度。零位是指扭角为（）度时；扭角最小时为（）度，此时液位最高。

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氨基酸中既含有（）又含有（），因此氨基酸表现两性。

对于离心泵的说法：①为了防止发生气缚，启动前需要灌泵；②为了输送达到需要的流量，应在离心泵启动前打开出口阀；③为了防止压出管中的高压液体倒流，停车前应先关闭出口阀；④通过设计回流支路调节流量；⑤理论上只要泵具有足够的机械强度，其压头可达到无穷大，与输送的流量大小无关；⑥为了不发生汽蚀，应控制一定的安装高度。正确的说法是（）

A. ①③⑥
B. ②④⑥
C. ①③⑤
D. ①②③④⑤⑥

Aron Renate---was my best friend.We attended Brough School until I moved away in 1997,then we lost contact.She was redheaded like her mother.Any info pls send to Irene Zuckerbraun at e-mail:lenz2265@sbcglobal.net.What is it（）

A complaint letter
B. A thanks letter
C. A search notice
D. An application letter

Take two tablets with water,followed by one tablet every eight hours,as required.For maximum night-time and early morning relief,take two tablets at bed-time,Do not take more than six tablets in twenty-four hours.Reduce the amount if nervousness,restlessness,or sleeplessness occursIf one cannot sleep,it is suggested that he（）.

A. take two tablets before going to bed.
B. take less than two tablets before going to bed.
C. stop taking the medicine
D. ask advice of a doctor