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【单选题】
电磁式交流接触器和交流继电器的结构区别是:( )。A.
交流接触器有短路环，而继电器没有
B.
电磁机构不同
C.
没有区别
D.
灭弧装置不同
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反馈参考答案：
举一反三
【单选题】1下列脚本运行结果是( ) #!/bin/bash a=0 while [ $a –le 10 ] do echo $a ((a=$a+5)) done
A.
0,5
B.
0,5,10
C.
0,1,2,3,4,5
D.
0,5,10,15
【单选题】In radiotelephony，the spoken word for distress is ().
A.
Securite
B.
Safety
C.
Emergency
D.
MAYDAY
【多选题】下列语句中比较两个数大小的是( )
A.
test $num1 –le $num2
B.
[ $num1 –le $num2 ]
C.
[ $num1 –eq $num2 ]
D.
[ $num1 –g $num2 ]
【单选题】The term Mayday is explained as ___ in the radio regulations.
A.
M’aider in French which means “help me”
B.
mayday holiday in English which means “rest day”
C.
maybe a day which all vessels navigate in a same area
D.
the same pronunciation in other languages
【多选题】下列语句中比较两个数大小的是( )
A.
test $num1 –ge $num2
B.
[ $num1 –ge $num2 ]
C.
[ $num1 –le $num2 ]
D.
[ $num1 –gg $num2 ]
【单选题】Mayday is to be used to announce ______.
A.
a distress message
B.
an urgency message
C.
a safety message
D.
a message of SMCP
【单选题】MAYDAY is to be used to announce________.
A.
a distress message
B.
an urgency message
C.
a safety message
D.
a massage of SMCP
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