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【判断题】
if语句，switch语句可以嵌套，而且嵌套的层数没有限制。A.
正确
B.
错误
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皮皮学刷刷变学霸
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A.
核糖体是由两个大小不同的亚基组成(每个亚基由rRNA和蛋白质组成)
B.
核糖体是由tRNA和蛋白质组成
C.
核糖体由多种RNA组成
D.
核糖体是由rRNA和DNA组成
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A.
指导型，支持型，参与型，成就导向型；
B.
指示型，参与型，授权型，推销型；
C.
军官型，教练型，警察型，家长型；
D.
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A.
Who are you?
B.
I’m an English guide from Beijing China Travel Service.
C.
Here you are.
D.
Are you Miss White from New York?
E.
I’m so lucky that I could meet my guide as soon as I got off the plane.
F.
Can you help me?
G.
It will take us to the hotel.
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