B．efore doing any work on a hydraulic system equipped with accumulators, you should

A．drain the accumulators and purge with oxygen

B．bleed off all stored energy from the accumulators completely

C．charge the accumulators to prevent system energy loss

D．pump the hydraulic fluid into the accumulators to prevent fluid loss

[单选题]Before hydraulic starting of an engine on a covered lifeboat，what need NOT be checked?（）A . Fuel supply line valveB . Pressure registered on the accumulator gaugeC . Cold-spark voltage readings test lampD . Engine stop control

[单选题]The work they are doing is_____great value.A.inB.ofC.byD.from

[单选题]B．efore performing any maintenance on a hydraulic system storing energy in an accumulator, you shouldA．pressurize the system to test for leaksB．bleed off all pressure within the systemC．operate the machine until it reaches normal temperatureD．disconn

[单选题]Before starting any diesel or gasoline engine，which of the following must be checked? （）A . Oil levelB . Flow of cooling waterC . Exhaust dischargeD . All of the above

[单选题]which must work for years (96) any external power sourcA．withB．withoutC．asD．than

[单选题]Before the construction of the road, it was prohibitively expensive to tran

[单选题]Before doing a writing task, the teacher elicits students′ ideas by asking

[单选题]( ) from one phase are usually reviewed for completeness and accuracy and a

[单选题]It seems quite clearly unjust to pay two people different amounts of money

[单选题]It seems quite clearly unjust to pay two people different amounts of money