现代建筑装饰材料普遍采用的大理石,其主要成分是[ ] A.Na2CO3   B.

题型:选择题

问题:

现代建筑装饰材料普遍采用的大理石,其主要成分是[ ]

A.Na2CO3   

B.Ca(OH)2  

C.CaO   

D.CaCO3

考点:生活中的其他材料及应用(纳米材料、功能高分子材料等)
题型:选择题
若x,y满足条件
x+y≤3
y≤2x
,则z=3x+4y的最大值是______.
题型:选择题

读图,回答1~3题。

小题1:图中M处的地质构造是

A.山岭

B.谷地

C.背斜

D.向斜小题2:图中N处的地质作用是

A.沉积作用

B.变质作用

C.外力作用

D.岩浆活动小题3:南水北调工程影响的水循环环节是

A.①

B.②

C.③

D.④

题型:选择题

一心房颤动患者,突觉呼吸困难咳嗽、胸痛,心脏听诊闻及三尖瓣区舒张期奔马律其来源为()

A.左心房奔马律

B.右心房奔马律

C.左心室奔马律

D.右心室奔马律

E.重叠奔马律

题型:选择题

选择句子,补全对话, 其中有两项是多余的。

A: Hello, sir, may I talk with you in English?

B: Of course.

A: I have learned English at school for one year. I have very few chances to talk with the

    English-speaking people. 1. _____

B: Oh, you speak English very well.

A: Thank you. By the way, 2. _____

B: No, I'm not. 3. _____

A: How long have you been in this city?

B: 4. ____ 

A: I see. Do you like this city?

B: Yes. I like it very much. It's a beautiful city.

A: Thank you. 5. _____ 

A. are you a student from America?

B. Not good.

C. So I want to practice English.

D. I’ve lived here since three weeks ago.

E. I’m a student from Australia.

F. Do you like it?

G. I’m glad you like it.

题型:选择题

中间神经元是在()之间起联络作用的神经元。

A.感觉神经元与运动神经元

B.躯体神经和自主神经

C.传入神经元和传出神经元

D.交感神经和副交感神经

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