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 quality of the fuel oil and lube oil （）, Im afraid.A . has much to do with the operation of the engine and its lifeB . have much to do with the operation of the engine and its lifeC . has much doing with the operation of the engine and its lifeD
[单选题]In a typical fuel oil system, the oil is stored in tanks in the double bottom from which it is pumped to （） and heated.A . a service tankB . a collecting tankC . a sumpD . a settling tank
[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]Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?A．compression must be low for effective spark ignitionB．compression must be low for required horsepower and torque
[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.