《煤矿安全规程》规定应当建立瓦斯抽放系统的矿井，必须进行瓦斯抽放，建立地面永久抽放瓦

阅读对话，判断句子正误，正确的画“√”，错误的画“×”。

Mike: Hi! Amy. What does your mother do?

Amy: My mother is a salesperson.

Mike: What does she sell?

Amy: She sells shoes in a store. Her hobby is shopping. What about you, Mike?

Mike: My mother is a nurse. She works in the Center Hospital.

Amy: Really? My father works in that hospital, too. He is doctor.

Mike: What's his hobby?

Amy: He likes diving. Does your mother like singing?

Mike: No, she doesn't. She likes dancing.

( ) 1. Amy's mother sells shoes.

( ) 2. Mike's mother likes shopping.

( ) 3. Amy's father is a doctor in the Center Hospital.

( ) 4. Amy' s father likes diving.

( ) 5. Mike's mother likes singing.

根据首字母提示，补全单词，完成句子。

1. This is my f        . Her name is Lucy.

2. Class, l         at the books and check.

3. He’s Chinese. His h       is black.

4. Jackie Chan’s n       is a little bit big.

5. I like r           books very much.

含碳量愈高的钢，其焊接性能愈好。( )

芍药属原置于毛莨科之中，毛莨科为被子植物中一个相当原始的类群，现芍药属独立为科。却仍放在五桠果亚纲中最原始的目中，这主要因为芍药属（）。

A.花大而美丽

B.离心式发育的雄蕊

C.心皮离生

D.B和C

搁栅式木面层地面施工工艺流程为（）。

A.基层清理→弹线定位→安装木搁栅→铺毛地板→打磨→铺面层地板→安装踢脚板→油漆→打蜡

B.基层清理→弹线定位→铺毛地板→打磨→铺面层地板→安装木搁栅→安装踢脚板→油漆→打蜡

C.基层清理→弹线定位→安装木搁栅→铺毛地板→铺面层地板→打磨→安装踢脚板→油漆→打蜡

D.基层清理→弹线定位→铺毛地板→打磨→安装木搁栅→铺面层地板→安装踢脚板→油漆→打蜡