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【单选题】
如图所示为氢原子能级的示意图,现有大量氢原子处于n=4的激发态,当向低能级跃迁时辐射出若干不同频率的光。关于这些光,下列说法正确的是( )A.
波长最长的光是由n＝4能级跃迁到n＝1能级产生的
B.
频率最小的光是由n＝2能级跃迁到n＝1能级产生的
C.
这些氢原子总共可辐射出3种不同频率的光子
D.
用n＝2能级跃迁到n＝1能级辐射出的光照射逸出功为6.34 eV的能发生光电效应
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举一反三
【单选题】(2013·浙江高考)Eye doctors recommend that a child's first eye exam ________ at the age of six months old.
A.
was
B.
be
C.
were
D.
is
【单选题】Which of the following best describes the author's attitude towards busing cutbacks?
A.
Favorable.
B.
Critical.
C.
Objective.
D.
Indifferent.
【简答题】favo(u)rite
【单选题】The teacher told us that the sun______bigger than the earth. A. is B. was C. has been D.will be
A.
1
B.
2
C.
3
D.
4
【单选题】血浆晶体渗透压下降,伴有循环血量严重不足时,将出现:( B )
A.
ADH分泌减少,尿量增多
B.
ADH分泌增多,尿量减少
C.
ADH分泌增多,尿量增多
D.
ADH分泌不变,通过肾血流量自身调节,使尿量减少
E.
ADH分泌减少,通过肾血流量自身调节,使尿量减少
【单选题】血浆晶体渗透压下降,伴有循环血量严重不足时,将出现( ):
A.
ADH分泌减少,尿量增多
B.
ADH分泌增多,尿量减少
C.
ADH分泌增多。尿量增多
D.
ADH分泌不变,通过肾血流量自身调节,使尿量减少
【单选题】Eye doctors recommend that a child’s first eye exam ________ at the age of six months old. (2013·浙江，8)
A.
was
B.
be
C.
were
D.
is
【单选题】听力原文：W: I know you're busy, but how about attending a film festival tonight? Your favorite star will make an appearance. M: You think I'd give that a miss? Q: What will the man probably do? (17)
A.
He might miss it because he's very busy.
B.
He probably won't go since his favorite stars are missing.
C.
He'll definitely go though he's very busy.
D.
He'll try to make it if he is not too busy.
【简答题】favo(u)r
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