1. If large facilities to ensure no oil, no oil pump need not choose ethnic groups, such as: water pump, molecular sieve adsorption pump, sputterionpumps, heat pumps.
若设施宽大务求无油时，无须选各族无油泵，如：水环泵、分子筛吸附泵、溅射离子泵、高温泵等。
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2. If large facilities to ensure no oil, no oil pump need not choose ethnic groups, such as: water pump, molecular sieve adsorption pump, sputterionpumps, heat pumps.
