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【简答题】
二极管由 个 PN 结构成。二极管的主要特征是 。
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举一反三
【单选题】关于函数参数传递中,形参与实参的描述错误的是:
A.
Python实行按值传递参数。值传递是指调用函数时将常量或变量的值(实参)传递给函数的参数(形参)。
B.
实参和形参分别存储在各自的内存空间中,是两个不相关的独立变量。
C.
在函数内部改变形参的值时,实参的值一般是不会改变的。
D.
实参和形参的名字必须相同。
【单选题】听力原文：M: I wish I didn’t have to make a special trip to the police station to get my passport? W: Well, if you call them in the morning, they’ll send your passport to you by post in the afternoon. Q: W...
A.
Go to the police station in the afternoon to get his passport.
B.
Call the police office to make sure the time for getting his passport.
C.
Call the police office to get his passport mailed to him.
D.
Go to the post office in the morning to get his passport.
【单选题】--- Got your US visa? ---Not yet. I too busy to apply for an appointment, so I didn’t go to Shanghai last week?
A.
was
B.
have been
C.
had been
D.
would be
【单选题】Not until actually faced with water scarcity______appreciate the value of water to a region.
A.
one can
B.
one cannot
C.
can one
D.
cannot one
【单选题】关于函数参数传递中，形参与实参的描述错误的是（）
A.
Python实行按值传递参数。值传递指调用函数时将常量或变量的值传递给函数的参数
B.
实参与形参分别存储在各自的内存空间中，是两个不相关的独立变量
C.
在函数内部改变形参的值时，实参的值一般是不会改变的
D.
实参与形参的名字必须相同
【单选题】I didn’t go to your party because my boss asked me to go to Beijing on behalf of (代表)our company for an ______ matter.
A.
important
B.
impressive
C.
additional
D.
extra
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