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【简答题】
线性定常系统的偏差信号就是误差信号的条件为( )。
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举一反三
【简答题】在半导体电力电子开关器件中,属于不可控器件的是 ,属于半控器件的是 ,属于全控器件的有 , , 。
【单选题】The correct description in the following is( ) if a variable is declared in a compound statement in a function
A.
the variable is valid within the compound statement only
B.
the variable is valid in the function
C.
the variable is valid in the program
D.
the variable is invalid
【简答题】The ( ) of an atom is a number that represents the electric charge that the atom would have if the electrons in a compound were assigned to the atoms in a certain conventional way.
【单选题】In a compound, the______element of the compound determines the new word class.
A.
first
B.
second
C.
neither
D.
both
【判断题】The meaning of a compound is the combination of the meanings of the words in the compound.
A.
正确
B.
错误
【简答题】第二次妇女运动开始于20世纪60年代中期,运动的基调就是要消除()。
【简答题】在所学习的电力电子器件中,属于半控型器件的是___, 属于全控型器件具工作频率最高的是___,属于不可控器件的是___。
【单选题】If a variable is declared in a compound statement within a function, the variable( )
A.
is valid in the compound statement only
B.
is valid in the function
C.
is valid in the program
D.
is an illegal variable
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