泵的响声大、发热、电流低且波动、压力低、不出水，其原困是（）。A.出口阀门没打开或阀

Look at the boy. His English name is Mike Smith. His Chinese name is Li Hai. He is from England. He’s twelve years old. My name is Hao Gang. Tom is my English name. I’m from Shanghai. I’m thirteen. Mike and I are good friends. We are in Grade Seven. I am in Class 3 and he is in Class 5. Today is Thursday. We want to swim after school.

小题1:How old is Li Hai?

A．10 years old.

B．11 years old.

C．12 years old.

D．13 years old.小题2:Where is Tom from?

A．Beijing.

B．Tianjin.

C．Shanghai.

D．Guangzhou.小题3:What class is Li Hai in?

A．Class 2.

B．Class 3.

C．Class 4.

D．Class 5.小题4:What day is it tomorrow?

A．Wednesday.

B．Thursday.

C．Friday.

D．Saturday.小题5:．Which of the following is right?

A．Mike and Tom are in the same grade.

B．Mike and Tom are in the same class.

C．Mike and Tom are from the same country.

D．Mike and Tom are the same age.

声音是由物体的______产生的，物体发出的声音以______的形式通过介质向远处传播；小明的眼镜脏了，拿到眼镜店用超声波进行清洗，说明超声波具有______．

阴茎海绵体发生纤维性硬结，中医称之为（）

A.肾岩

B.软下疳

C.硬下疳

D.阴茎痰核

E.子痰

按照罪犯的（）进行分类关押，是深层次的分押工作。

A.年龄

B.所判刑种

C.所判刑期

D.犯罪类型

基层建设是企业生存和发展必须认真抓好的一项经常性、（）工作。

A.关键性

B.重要性

C.基础性

D.例行性