一个3功分器的插损指标为0.1dB,若输入信号为30dBm,则通过分路器后,各端口的输出信号分别为()dBm。
参考答案:251
My mother felt very __________ when she heard the news.[ ]
A. surprise
B. surprising
C. surprised
D. to surprise
Though golden weeks over the past eight years have______huge returns for China's tourism industry,voices ______ cancellation of the nationwide holidays are becoming even stronger.
A.brought about;calling for
B.brought up;called on
C.brought in;calling in
D.brought on;called up