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单选题
Check value is used to control （）
A
direction of oil flow
B
back pressure of return oil
C
bypass of filter
D
high pressure overflow
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Good morning passengers，please form a queue and go through the passport control and security check one by one
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单选题Hydraulic control check value is generally used to （） in the marine hydraulic mechanism.A
control the back pressure of return oilB
lock the oil lines under some conditionsC
change the direction of oil flowD
act as relief valve
考题
单选题What statement is true？（）A
Link Control Protocol（LCP） is used for basic PPP link setup and operationB
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单选题The（）enables water to be blow down or emptied from the boilerIt may be used when partially or completely emptying the boiler.A
main stem stop valveB
auxiliary steam stop valveC
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proportion controlC
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A check constraint on the EMPLOYEE tableB
A unique constraint on the EMPLOYEE table WORKDEPT columnC
A foreign key reference from the DEPARTMENT tables DEPTNO column to the WORKDEPT column of the EMPLOYEE tableD
A foreign key reference from the EMPLOYEE tables WORKDEPT column to the DEPTNO column of the DEPARTMENT table
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