When the water produced from most evaporator is supplied for drinking purpose, it must be treated to ensure it is biologically pure and _____.

A．slightly acidic

B．slightly alkaline

C．no salty

D．slightly bitter

[单选题]High-water marks are typically used when calculating the incentive fee on h

[单选题]In competitive markets, when the efficient quantity is produced, the least

[单选题]The water level in the gauge glass when a boiler is operating is _____ when the boiler is shut down.A．lower thanB．higher thanC．belowD．equal to

[单选题]In order to use the water from the stove, there ______ be a pipe connecting the tub with the stove.A． mustB． seemed toC． needn'tD． should

[单选题]Water, when boiled, always ______ steam.A． gives inB． gives upC． gives offD． gives away

[单选题]When __________is produced, complete closure of the articulators is involve

[单选题]_______can cause oil flow from water outlet of the oil purifier.A．Oil inlet valve opening too quicklyB．Oil temperature little higher than normalC．Diameter of gravity disc too smallD．Viscosity of oil little lower than normal

[单选题]When was duet most probably found to be the very hero? ( )A． the day when he was leaving for home.B． a couple of days after the girl was rescuedC． the first day when he was in New YorkD． the same day when he was interviewed.

[单选题]When was duet most probably found to be the very hero?A． the day when he was leaving for home.B． a couple of days after the girl was rescuedC． the first day when he was in New YorkD． the same day when he was interviewed.

[单选题]Changing from solid to liquid, water takes in heat from all substances near