网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
When adding oil to a refrigeration system, precautions must be taken to ensure that
A.the compressor suction pressure is not too high
B.all air is purged from the pump and charging fittings
C.the high pressure cutout switch is held open to prevent accidental starting
D.the condenser is completely shutdown first
参考答案
更多 “ When adding oil to a refrigeration system, precautions must be taken to ensure thatA.the compressor suction pressure is not too highB.all air is purged from the pump and charging fittingsC.the high pressure cutout switch is held open to prevent accidental startingD.the condenser is completely shutdown first ” 相关考题
考题
9． _______you _______ stay at home today?A． Do ; have toB． Must; have toC． Have; toD． Do ; must
考题
It's useless to ( ) her that she doesn't need to lose any weight.
A.believeB.convinceC.sayD.ensure
考题
3．—__________ 1 go out for a while?—No，you __________ You must finish your homework first．A． Must，needn'tB． Can，mayC． May，mustn'tD． May，must
考题
It should be ______ that any maritime liens attaching to the ship at the time of her arrest have priority over the claim for which she was arrested．A.notedB.seenC.watchedD.taken
考题
Information on shipping movements can be______by radio from Dover Port Control．A.gotB.madeC.obtainedD.Taken
考题
Consequently，a sustainable business model can______companies to better adapt to complex environments and achieve sustainable competitive advantages。A.render
B.enable
C.cause
D.ensure
考题
Care providers also need to help patients to manage their feelings of uncertainty and______them of the benefits of modern medicine and technology which can substantially aid in health improvement。
A.assure
B.insure
C.sure
D.ensure
热门标签
最新试卷