单项选择题
A.to be kept B.logged C.changed D.has remained
The oil was pumped up in the settle tank such a height ...
单项选择题The oil was pumped up in the settle tank such a height that it ().
A.spilled B.overflowed C.sprayed D.injected
The oil quantity for bearing lubrication should be appl...
单项选择题The oil quantity for bearing lubrication should be applied in such an amount as to be sufficient to carry away the () caused by the friction at the bearings.
A.acids B.additives C.heat D.gear
The oil lubricating diesel engine cylinders usually con...
单项选择题The oil lubricating diesel engine cylinders usually contain additives formulated to impart a high degree of alkalinity to () the acid conditions.
A.invade B.provide C.detergent D.neutralize