皮皮学，免费搜题
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【单选题】
不位纵隔的结构是( )A.
胸腺
B.
主动脉弓
C.
奇静脉和半奇静脉
D.
气管
E.
食管
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知识点：
皮皮学刷刷变学霸
举一反三
【简答题】What advice might Cartwright give to those who sometimes have had dreams? [A] Lead your life as usual. [B] Seek professional help. [C] Exercise conscious control. [D] Avoid anxiety in the daytime.
【单选题】So, I'm not sure about the advice.
A.
It is giving advice.
B.
It is responding to advice.
【单选题】What advice might Cartwright give to those who sometimes have bad dreams?
A.
Lead your life as usual.
B.
Seek professional help.
C.
Exercise conscious control.
D.
Avoid anxiety in the daytime.
【单选题】关于催化剂的描述下列哪一种是错误的()。
A.
催化剂能改变化学反应速率
B.
催化剂能加快逆反应的速率
C.
催化剂能改变化学反应的平衡
D.
催化剂对反应过程具有一定的选择性
【单选题】关于催化剂的作用，下列说法中不正确的是()。
A.
催化剂改变反应途径;
B.
催化剂能改变反应的指前因子;
C.
催化剂能改变体系的始末态;
D.
催化剂改变反应的活化能。
【单选题】下列关于催化剂的说法，正确的是
A.
催化剂能改变化学反应进行的方向
B.
催化剂能改变化学反应进行的限度
C.
催化剂能改 变化学反应的反应热
D.
催化剂能改变化学反应的速率
【简答题】Why do economists sometimes offer conflicting advice to policymakers?
【单选题】Economists sometimes give conflicting advice because
A.
graduate students in economics are encouraged to argue with each other.
B.
economists have different values and scientific judgment.
C.
economists acting as scientists do not like to agree with economists acting as policy advisers.
D.
economics is more of a belief system than a science.
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