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紫外分光光度吸收系数法测定地西泮片含量的计算式

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当国际收支发生顺差时，流入国内的外汇量小于流出的外汇量，外汇储备就会减少；当发生逆差时，外汇储备增加。()

A. 正确
B. 错误

下列关于领导技能表述不正确的是()。

A. 技术技能是一个人对某种类型的过程或技术所掌握的知识和能力。
B. 人际技能是有效地与他人共事和建立团队合作的能力。
C. 概念技能是按照模型、框架和广泛关系进行思考的能力。
D. 领导技能只能以通过学习和以获得知识为基础的方法来得到提高。

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紫外分光光度对照品对比法测定奋乃静片含量的计算式

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What are some of the steps a person can take to prevent his house from being broken into while he is away.'？ One step is to make sure that the house seems a lived-in one. Living room curtains should be pulled down only half-way. Bedrooms that usually have the curtains pulled down at night should be left down. Another is to make sure that all outside locks are the dead-boh type (双保险). Still another is to leave several IOOW lights burning and make sure that one is in the kitchen.
Lights that turned on and off by themselves are the best. Then, too, it is a good idea to leave the radio turned on and set to a talking station. Any type of speaking makes a thief think twice before trying to enter. Finally, while away on holiday, make sure that nothing collects in front or in the house. Particularly, make certain that the newspaper is stopped and that a trusted neighbour has been asked to pick up the mail. Thieves are especially quick to notice piled-up newspapers and overpiled mail boxes.
Why did the writer begin this piece with question？

A. Because he wanted to catch the readers' attention.
Because he wanted to have the readers guess the answer before reading.
C. Because he wanted to sum up (概括) the topic of the piece.
D. Because he wanted to make the readers understand him better.

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