题目内容

酮替芬作用机制是

A. 激动β受体
B. 激动β受体
C. 阻断腺苷受体
D. 阻断H受体
E. 阻断M受体

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沙丁胺醇作用机制是

A. 激动β受体
B. 激动β受体
C. 阻断腺苷受体
D. 阻断H受体
E. 阻断M受体

骨肉瘤血清增高的是

听力原文：M: Doctor, I feel sick. I have a bad stomachache, and my head troubles me a lot.
W: Well, let me have a check. Open your mouth, please. And say "Ah".
M: Ah! Is that serious, doctor？
W: Not really. Did you have your supper this evening？
M: No, I only had some bananas.
W: And the bananas were not quite ripe, right？
M: Well, yes, they were a bit green.
W: That explains it.
M: I wish I had not eaten them.
W: Take this medicine twice a day and I' m sure you' 11 be fine.
Did the man have a bad headache？

A. Yes, he did.
B. No, he didn't.
C. We are not sure.

对输往特殊国家的木质包装，自2000年1月1日起，海关凭出入境检验检疫机构签发的《出境货物通关单》验放。()，

A. 正确
B. 错误