铝在空气中会迅速的跟氧结合,在表面形成一层坚韧的氧化铝薄膜。这层膜不但能防止铝的内层

题型:单项选择题

问题:

铝在空气中会迅速的跟氧结合,在表面形成一层坚韧的氧化铝薄膜。这层膜不但能防止铝的内层继续与氧结合,起到保护作用,而且对许多腐蚀性介质除了()以外均具有较强的抵抗能力。

A.质量分数为98%的浓硝酸

B.碳酸氢铵

C.氨水

D.甲醛

考点:管道工考试中级管工考试中级管工考试题库
题型:单项选择题

阅读理解。

     Today is Sunday. I haven't got any classes. I'd like to visit my grandparents in the morning. They are

seventy years old. In the afternoon, I'd like to play basketball with my friends. We all like playing basket-

ball. In the evening, I'd like to do my homework. Then I watch TV. 

1. Today is _____.

A. Friday

B. Saturday

C. Sunday

D. Monday

2. I'd like to _____ in the morning.

A. visit my grandparents

B. do my homework

C. go to the park

D. go to the cinema

3. I'd like to _____ in the afternoon.

A. play football

B. play basketball

C. see a film

D. watch a basketball match

4. I like playing _____.

A. tennis

B. basketball

C. football

D. table tennis

5. I _____ in the evening.

A. watch TV

B. don't watch TV

C. don't do my homework

D. read books

题型:单项选择题

根据有关规定,私自买卖外汇、变相买卖外汇或者倒买倒卖外汇的,外汇管理机关可以给予罚款处罚。该罚款的金额范围是( )。

A.违法所得1倍以上5倍以下

B.10万元以上50万元以下

C.违法外汇金额30%以上3倍以下

D.违法外汇金额20%以上5倍以下

题型:单项选择题

简述宗法制的特点。

题型:单项选择题

“板凳,板凳,歪歪,/菊花,菊花,开开!/开几朵?/开三朵。/爹一朵,/娘一朵,/剩下那朵给白鸽”。这首河南传统儿歌《菊花开》鲜明地体现了()儿歌特点。

A.内容浅近

B.篇幅短小

C.节奏明朗

D.句式整齐

题型:单项选择题

采煤机前方煤壁发生片帮,瓦斯涌出异常,机载瓦斯探头报警,应该立即()。

A.停机

B.继续割煤

C.撤出人员

D.向跟班人员报告

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