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【多选题】
链路预算得到的路径损耗值为中值，实际的路径损耗在此值上下波动，为了保证一定的边缘覆盖概率（比如>75%），需要留出一定的余量，这个余量主要与电波传播的下述特性无关的是哪些()。A.
频率选择性
B.
快衰落
C.
去极化现象
D.
阴影衰落
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反馈参考答案：
举一反三
【单选题】Which statement about the WebView submit command is true?（）
A.
The submit command exits the GUI.
B.
The submit command reboots the WX device.
C.
The submit command saves and writes the configuration to flash.
D.
The submit command is the same as the commit CLI command.
【单选题】About command ‘# mv abc xyz’, which statement is wrong:
A.
If abc is a normal file and xyz doesn't exist before, then this command will change the file name abc to xyz.
B.
If abc is a normal file and xyz is a directory, this command will move file abc into directory xyz.
C.
If abc is a directory and xyz is also a directory, this command will make abc to be the subdirectory of xyz.
D.
If abc is a directory and xyz is a normal file, this command will overwrite xyz, i.e. xyz will lost.
【单选题】--- I am interested in that beautiful bag. What do you charge for it? --- $ 120. --- ______ , but I can’t afford it.
A.
It is worth that
B.
It is really nice
C.
Please lower the price
D.
That is too dear
【单选题】Which command is used for a radio medical connection with a coast station?
A.
MSG+．
B.
TEST+.
C.
SOS+.
D.
MED+.
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