He wears a pair of sunglasses（）（惟恐被别人认出来）.
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1、What is a function of the wearing ring
What is a function of the wearing rings used in most centrifugal pumps?（）AAbsorb erosion of high velocity discharge streamBSeal pump shaft against entry of airCIsolate the discharge side from the suction sideDDampen the turbulent discharge flow
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2、The external circumference of a pair o
The external circumference of a pair of main bearing shells is slightly larger than that of the bore of the housing which receives themThe difference is termed （）.AnipBnapCgapDli
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3、He spends a quarter of the day（）
He spends a quarter of the day（）Ato sleepBsleepingCsleepsDto sleeping
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4、He always dreams of（）a chance for him
He always dreams of（）a chance for him to bring into full play his potential.Athere beingBthere to beCthere isDbeing
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5、He（）the suggestion as a way of getting
He（）the suggestion as a way of getting out of his financial difficulties.Atalked overBled toCseized onDstarted over
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6、The rate of wear on a cylinder liner d
The rate of wear on a cylinder liner depends on the （）Aquality of air filtrationBeffectiveness of lubricationCtype of fuel usedDall of the above