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【简答题】
下图为两结构尺寸相同的液压缸,A 1 =100cm 2 ,A 2 =80cm 2 ,p 1 =0.9Mpa,q 1 =15L/min。若不计摩擦损失和泄漏,试求: (1)当两缸负载相同(F 1 =F 2 )时,两缸能承受的负载是多少? (2)此时,两缸运动的速度各为多少?
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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】1下列脚本运行结果是( ) #!/bin/bash a=0 while [ $a –le 10 ] do echo $a ((a=$a+3)) done
A.
0,3
B.
0,3,6,9
C.
0,1,2,3,4,5
D.
0,3,6
【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
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