One of the reasons that causes oil flowed from sludge outlet of a self-cleaning purifier is

A．seal water supply be cut off

B．make-up water supply be cut off

C．oil outlet valve closed or not open sufficiently

D．the flow rate of oil is too much

[主观题]What causes the lube oil pressure of the engine to drop ?

[单选题]One of the most common causes of reduction gear failure is gear wear caused by scoring as a result ofA．surface fatigue of the gearsB．an inadequate lube oil filmC．plastic flow of the gearsD．fretting corrosion from water

[单选题]In discussing oil pollution, one important fact to remember is that the problem remains the same( )heavy( )light oil is spilled into the water.A．both/andB．whether/orC．neither/norD．because/so

[单选题]Fuel oil is thought to be one of the main factors （） the operation and maintenance of an engine.A . have nothing to do withB . having nothing to do withC . have much to do withD . having much to do with

[单选题]One of the main reasons for getting students to listen to spoken English is

[单选题]The reasons for the population decrease covers as follows except______.A．later marriageB．late pregnancyC．national family planning policyD．China

[单选题]F．or these reasons,I believe that lawmakers need to legislate (立法) against spam.Spammers should be fined,and perhaps sent to prison if they continue to disturb people.E-mail is a tool which helps people all over the world to communicate conveniently,

[单选题]This text mainly discusses（ ）[A] reasons to abolish the practice of tipping[B] economic sense of tipping[C]consumers' attitudes towards tipping[D]tipping for good service

[试题](b) State, with reasons, the principal additional information that should be made available for your review ofRobson Construction Co. (8 marks)

[试题](c) Explain the reasons for the concerns of the government of Happyland with companies such as TMC andadvise the directors of a strategy that might be considered in order to avoid being subject to any forthcominglegislation concerning the environment.