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【单选题】
下列分子中，属于含有极性键的非极性分子的是A.
PCl 3
B.
H 2 S
C.
P 4
D.
C 2 H 4
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】二阶系统(second order system)(名词解释)
【单选题】---I have got a pain in my neck. ---_______.
A.
Yes, I agree
B.
Yes, you are quite right
C.
I’m sorry to hear that
D.
I’m feeling sick
【单选题】【图片】Second-order transformations are continuous-phase transitions: there is no latent heat associated with the transition. Examples of those second – order transformations are:
A.
ferromagnetic transitions
B.
order–disorder transitions in alloys
C.
Superconductivity transitions
D.
All the above
【单选题】In order to work abroad, my sister decided to go to _______ college and study ______ second language. [ ]
A.
the; a
B.
the; the
C.
/; a
D.
/; the
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