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名词解释题
detergent(去垢剂)
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I would like to draw your attention ________ our new detergent powders.
A.forwardB.towardsC.forD.on
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单选题According to the instructions, which of the following is TRUE?A
The gasket should be cleaned thoroughly with cold water.B
Mild detergent and hot water can best clean the cooker.C
Soapy water will often damage the cooker.D
Sand can be used to clean the cooker.
考题
单选题Which of the following operations may be dangerous?A
Overfilling the cooker with food and water.B
Cleaning the cooker with detergent.C
Cooling the cooker with cold water.D
Setting too little cooking time.
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单选题If the detergent type lubricating oil being used in a diesel engine is black, the oil （）A
must be centrifugedB
must by filteredC
must be changedD
is holding finely dispersed carbon in suspension
考题
单选题Any carbon built up on surfaces must be washed away by （） additives and held in suspension by a （） additive.A
dispersant；detergentB
detergent；dispersantC
dispersant；dispersantD
detergent；detergent
考题
单选题The crank chamber oil （）.A
can be recoveredB
is only supplied to cylindersC
only feeds the main bearingD
is a kind of detergent
考题
单选题可使蛋白质发生变性的方法不包括（ ）。A
高温B
极端pHC
尿素D
去垢剂(如十二烷基磺酸钠)E
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