生殖生理的叙述下列哪项是正确的( )A．月经来潮时女性的基础体温可升高0.5℃ B

单词拼写。

根据下列句子及所给汉语注释, 在答题卡相应的位置上写出空缺处各单词的正确形式.

1. It's always difficult to be in a foreign country, _______ (尤其是) when you know little about the language.

2. In her dream,she came to a _______(荒芜的) place.

3. When they heard that the president was murdered, they were all in deep _______ (悲伤).

4. The boy always _____ (发音) the word in a strange way.

5. The ________(大多数 ) of middle-school students in China are studying English as a foreign language.

6. Some students will clean the streets and look after the old and the ________ (残疾人) .

7. It is reported that the fire_____ (毁坏)most of the building.

8. My grandma feeds a lot of ducks in_____ (秋天) in the pond in front of our house.

9. What are you two girls_____ (耳语) about?

10. Mr. Smith is a professor who is _____ (值得) of great respect.

高氯酸、硫酸、硝酸和盐酸都是强酸,其酸性在水溶液中差别不大。以下是某温度下这四种酸在冰醋酸中的电离常数:

从表格中判断以下说法中不正确的是(　　)

A.在冰醋酸中这四种酸都没有完全电离

B.在冰醋酸中高氯酸是这四种酸中最强的酸

C.在冰醋酸中硫酸的电离方程式为H₂SO₄2H⁺+S

D.水对于这四种酸的强弱没有区分能力,但在醋酸中可以区别这四种酸的强弱

下列关于行政许可原则的说法正确的是（）。

A.行政许可的设定必须有明确的法律依据，体现了行政许可法定原则

B.所有的行政许可的实施结果都要公开，这是行政许可公开原则的要求

C.行政许可公示制度体现了行政许可公开、公平、公正原则

D.行政相对人享有申请行政复议和诉讼的权利体现了行政许可的监督原则

E.行政许可所依据的法律、法规和规章修改或废止的，为了公共利益的需要，行政机关可以依法变更已经生效的行政许可，这是行政许可信赖保护原则的体现

什么叫沉淀滴定法？沉淀滴定法对沉淀反应有哪些要求？

异步电动机的启动有哪几种方式？