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【单选题】
氢原子第一玻尔轨道半径的大小为A.
0.53nm
B.
m
C.
cm
D.
20.6埃
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反馈参考答案：
举一反三
【单选题】登门拜访他人时,以下哪种做法是正确的?
A.
未经主人邀请和许可，不进入卧室
B.
入座之后不能走动
C.
主动参观主人家里的摆设，自由进入各个房间
D.
随意翻看桌上的书籍、杂志
【单选题】Hillen used to be very shy, but she has grown________it now.
A.
without
B.
over
C.
away
D.
out of
【单选题】By saying that 'blues and jazz overlapped' (the first sentence of the last paragraph), the author means______
A.
blues developed in the same pattern as jazz did'
B.
the two music forms shared some features
C.
people can never tell one from the other
D.
jazz is the source from which blues evolved
【多选题】在和他人一起用餐时，你的哪些举止是文明的（）
A.
用餐中途离开，餐巾可以放在椅子上，搭在椅背上或随手带着。
B.
用餐时一般请尊者上坐，上坐的位置是能在第一时间看到进出之门的座位。
C.
吐出的骨刺等物，放在瓷盘（或放在纸上），不要直接放在餐桌上。
D.
餐桌上一般是先让尊者用菜，男士主动为邻座的女士让菜
【简答题】Blues music first became __________ with the American public in the nine twenties
【单选题】According to paragraph 4，which of the following statements is NOT true?
A.
She has to learn to repair sails．
B.
She has to be her own teacher．
C.
She has to be very fit．
D.
She has trained herself to sleep for about 20 minutes at a time．
【简答题】试述心房颤动的心电图特征。
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