The drinkingwater is [contaminated] with impurities.

[单选题]Impurities in the fuel oil will affect the operation of the engine, which has （） the use of separator and some other devices.A . brought aboutB . caused forC . resulted fromD . led

[单选题]When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.A . filter to remove the fuel oilB . use the settler to remove the fuel oilC . remove the fuel oil by centrifugingD . drain and then renew the lube oil supply

[单选题]The big lake was [contaminated]with waste waters from nearby factories.A.wi

[单选题]As the industrydeveloping in these years,most of the rivers have been [cont

[单选题]Pure feldspar isa colorless,transparent mineral,but impurities [commonly] m

[单选题]Pure feldspar isa colorless,transparent mineral,but impurities [commonly] m