判断题

风道中的阻力就是摩擦阻力。

答案：错误

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单项选择题

‎The difference between the resulting equations for a network in which an npn transistor has been replaced by a pnp transistor is _____‏

A．the values of the resistors
B．All of the above
C．the sign associates with the particular quantities
D．the value of β

单项选择题

形声字的形旁表意，声旁表音不表意。

A．对
B．错