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【单选题】
等容收缩期之末刚好是:A.
房室瓣关闭
B.
室内压开始超过房内压
C.
QRS波起点
D.
第二心音开始
E.
主动脉血压最低
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反馈参考答案：
举一反三
【单选题】With the development of modern society, some traditional customs are gradually . [ ]
A.
dying of
B.
dying out
C.
dying down
D.
dying off
【简答题】In the view of Freed, some traditional Indian patterns can be seen as an adaptation to the high ______.
【单选题】It can be seen form. time passage that in the second stage
A.
some traditional goods and services were not successful when provided by the home economy
B.
the market economy provided new goods and services never produced by the home economy
C.
producing traditional goods at home became socially unacceptable
D.
whether new goods and services were produced by the home economy became irrelevant
【单选题】水分子通过（）的作用可与另4个水分子配位结合形成正四面体结构。水分子通过（）的作用可与另4个水分子配位结合形成正四面体结构。水分子通过（）的作用可与另4个水分子配位结合形成正四面体结构。
A.
离子键
B.
范德华力
C.
氢键
D.
二硫键
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