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【单选题】
下列缺O2对呼吸影响的叙述，正确的是A.
直接兴奋延髓呼吸中枢
B.
直接兴奋脑桥呼吸中枢
C.
主要通过中枢化学感受器
D.
轻度缺O2时呼吸加深加快
E.
重度缺O2时呼吸加深加快
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【简答题】补全对话 M : Mary , have you ever been to the Great Wall ? W : No , actually I've never been there. __ 1 __ M : Would you like to go to the Great Wall ? W : __ 2 __ I've been waiting for it so long. M...
【简答题】证明，若函数f(x)与g(x)连续，则函数 φ(x)=min(f(x)，g(x))与ψ(x)=max(f(x)，g(x))也连续
【简答题】w____ ready to do sth
【单选题】对表面活性剂的临界胶束浓度叙述正确的是
A.
临界胶束浓度是开始形成胶束时表面活性剂的最低浓度
B.
临界胶束浓度的数值只受温度、分子缔合程度的影响
C.
临界胶束浓度的大小只受表面活性剂用量的影响
D.
临界胶束浓度的数值不受 pH 及电解质的影响
【简答题】表面活性剂的临界胶束浓度的定义。
【简答题】1W: What would you like, Pepsi-Cola or Coca-Cola? M: Pepsi-Cola, please. Q: Where are they talking? 2M: So, do you enjoy Chinese food? W: Why not? Q: What does the woman mean? 3W: You seem to...
【单选题】听力原文：W: I've finally finished typing my homework paper. M: Tell me when it's ready. I want to see it. Q: What docs the man want to do? (3)
A.
Read the woman's paper.
B.
Borrow the typewriter.
C.
Visit the woman.
D.
Go home soon.
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