单项选择题

The mechanical energy can be changed back into electrical energy by means of a generator．

A．通过发电机这种途径可以将机械能转变为电能。
B．利用发电机可以将机械能转变为电能。
C．借助于发电机可以把机械能返回电能。
D．使用发电机这个方法能将机器产生的能量还原成电。
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单项选择题
A computer is a machine' designed to______.
A．perform work mathematically
B．perform complicated calculations
C．store and select information
D．all of the above
单项选择题
The use of computers for specialized purposes depends on the______.
A．design of the computer
B．power used to operate the computer
C．difficulty of the mathematical calculations involved
D．the ability of the programmer
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