Having（）the bear in the woods for one

1、The volute pump is one in which the im

The volute pump is one in which the impeller （）.Adischarges into a gradually widening channelBhas stationary diffuser vanesCproduces no kinetic energyDAll of the above are true

2、Having been on the（）for the whole mon

Having been on the（）for the whole month, the criminal decided to turn himself in to the police.AescapedBcaughtCwayDru

3、The oil quantity for bearing lubricati

The oil quantity for bearing lubrication should be applied in such an amount as to be sufficient to carry away the （） caused by the friction at the bearings.AacidsBadditivesCheatDgear

4、Small crack in the crankshaft bearing

Small crack in the crankshaft bearing surface of a diesel engine are an indication of（）Acorrosion frettingBinsufficient lubricationCabnormal wearDfatigue failure

5、The（） is fitted in pair one is the mai

The（） is fitted in pair one is the main valve, the other the auxiliary or standby.Amain stem stop valveBauxiliary steam stop valveCfeed check or control valveDblow down valve

6、In the （） refrigeration compressor one

In the （） refrigeration compressor one end of the crank shaft extends through the crankcase house for connection, via a coupling or pulley, to an external drive motor.Aopen-typeBhermeticCsemi-hermeticDall the above