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问题 单项选择题

下列属于主动转运是（）

A．人体内O2、CO2进出细胞膜

B．蛋白质从细胞外液进入细胞内

C．葡萄糖由细胞外液进入细胞内

D．Na+由细胞内向细胞外转运

E．肌浆网终末池的Ca2+流入胞浆

答案

参考答案：D

补全对话，情景问答

根据对话内容，选出适当的选项补全对话。

A: Hi.    1  

B: It was great!

A:    2    

B: I went to Tokyo with my family.

A:    3    

B: Yeah,I did.

A:    4    

B: Oh, they were expensive.

A: And how were the people?

B: Yeah, the people were really friendly. And we had dinner at their house.    

A:    5      

B :lt was delicious. I love Japanese food!

A: where did you go?

B: How was your vacation?

C: Did you go shopping?

D: How were the stores?

E: How was the food?
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问答题

简述反射波法检测桩基完整性的基本原理，现场检测前应做哪些准备工作
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