A、when
B、how
C、where
D、whether
更多“The pressure difference before and after the lube oil filter indicates （）the filter should be cleaned.”相关的问题
A、increase the flow of the cooling water through the condenser B、adjust the high pressure cutout to maintain the desired pressure C、open the hot gas bypass temporarily to reduce capacity D、purge non-condensable gases to reduce the excess pressure
A、a high-pressure area B、pressure difference over horizontal distance C、pressure difference over time D、vertical pressure variation
A、dryer the air mass will be B、cooler the temperature will be C、greater the force of the wind will be D、warmer the temperature will be
A、Length of the discharge pipe B、Height of the discharge pipe C、Difference between the discharge and suction pressures D、Sum of discharge and suction pressures
A、a difference in water pressure B、the method of breaking up the water stream C、the length of the applicator D、All of the above
A、the amount of lube oil additives increase B、piston speeds increase C、injection pressure decrease D、engine speeds decrease
A、Water is heated into vapor on heating surfaces B、Water is vaporized by pressure difference C、There are no heating-transfer surfaces D、There are more heating-transfer surfaces
A、difference between the reading of the two pointers，which shows wind direction B、last two figures of the reading of the pointer，such as 87，76，or 92 C、present reading of the pressure，combined with the changes in pressure observed in the recent past D、weather indications printed on the dial (such as cold，wet，etc.) under the pointer
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