个体工商业户建立简易账簿应采用( )。A．活页式 B．卡片式 C．台账式 D．订本

根据短文内容和所给的首字母，写出短文中所缺的单词，使短文完整、合乎情景。

Hi everyone, I’ve been in Xuzhou for over a week now. I’m having a g  小题1:time. During the first f  小题2: days I visited some tourist attractions — Yunlong Lake, Yunlong Hill, Guishan Han Tomb(汉墓), etc. Most p  小题3: were crowded with tourists, so yesterday I went shopping and I b 小题4: some souvenirs. Today I went to an interesting art gallery. I got lost on my w  小题5: back to the hotel, but it didn’t matter— I found a really good market w 小题6: lots of small shops. I ate in the hotel the first night, but usually I go out and have dinner in a restaurant b 小题7: the food is fantastic. I’ve s 小题8: a lot of money, but it’s certainly worth it. I like people in Xuzhou. They are s 小题9: nice people! I’ve taken many photos so you’ll be able to see f 小题10: yourself when I come back home next Wednesday. See you then!

半衰期为3.8天的核素是（）

A．⁸⁹Sr

B．¹⁵³Sm-EDTMP

C．¹⁸⁶Re-HEDP

D．³²P

E．⁹⁰Y

对以暴力方法抗拒或者阻碍人民警察依法履行职责，未危及人民警察生命安全的，可以使用（）。

A.制服性警械

B.驱逐性警械

C.武器

D.警械或武器

During a training exercise a submarine indicating that a torpedo has been fired will send up smoke from a float. The smoke’s color will be（）.

A.black

B.red

C.orange

D.yellow

什么是湿法冶金？