课余休闲活动属于校外休闲辅导的范畴。

某镇要修一条水渠，第一周修了全长的50%，第二周修了全长的30%，还剩300米没有修，这条水渠全长多少米？

在空白处填入单词、短语或句子完成对话。

A: We often say in Britain,  "When in Rome,  do as the Romans do. "

B:  _ 1     ?

A: It means that people from different countries do things differently.  Shall I tell you about my worst 

    mistake in China?

B: Go on, please.

A: It was on my first trip to China.  Some Chinese people at my school were very kind to me. They

    often asked me to stay in their house and     2       me... At the end of my stay I took them some

    flowers.  But they didn't look very __3__ 

B: What color were they?

A: White! 1 made a really terrible   _4     .

B: Oh dear! I also have a story about flowers.  I went to my teacher's house for a party  when I was in

    France __5__.  When 1 arrived at the house I gave them to my teacher's wife.  She laughed and her

    face turned red.  But my teacher didn't laugh.

A: Why?

B:  Because I gave red roses to her,  which mean "I love you. "

A: So, it's necessary for us to learn some culture about different countries.

治疗甲状腺危象，应选择的药物是（）

A.小剂量碘

B.大剂量碘

C.甲状腺素

D.小剂量放射性碘

E.大剂量放射性碘

将淬火后的铝合金在低温下存放可以推迟时效的原因是什么？（）

A.低温下合金元素原子的活动能力小，从固溶体中析出的速度很慢。

B.低温下合金元素原子的活动能力小，溶解到固溶体中的速度很慢。

C.低温下合金元素原子的活动能力小，生成的金属化合物不稳定。

D.低温下合金元素原子的活动能力小，生成的金属化合物过于稳定。

乙烯制冷压缩机开车前透平必须盘车24小时以上。