问题
单项选择题
使用频谱仪测试主机输出功率时,要在输入口接()。
A.环形器
B.衰减器
C.负载
D.功分器
答案
参考答案:B
使用频谱仪测试主机输出功率时,要在输入口接()。
A.环形器
B.衰减器
C.负载
D.功分器
参考答案:B
根据句意,用方框内所给单词的适当形式填空。(每小题1分,共5分)
小题1:I often hear them ____the piano in the room. 小题2: Teachers’ Day in the _____month of the year . 小题3:Tom fell ____in the class yesterday because he was very tired. 小题4:—Excuse me ,what’s the price of these ___? —Six yuan a kilo . 小题5: I think Sally will be the ____of the English competition in our school. |