题目内容

There ________ some water in the bottle.

A. are
B. is
C. has
D. have

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There ________ something wrong with my car.

A. are
B. has
C. is
D. have

There ________ a pencil and two pens in the pencil-box.

A. are
B. has
C. have
D. is

从传输线方程看,传输线任一点处的电压或电流等于该处相应的( )的叠加。

A. 入射波和反射波
B. 驻波和行波
C. 入射波和正向行波
D. 反射波和反向行波

下面不属于无损耗线工作状态的是( )。

A. 行波
B. 驻波
C. 行驻波
D. 反射波