An increased pressure differential between the inlet and outlet of a strainer usually indicates the strainer is （）

[单选题]The pressure differential across a diesel engine lube oil system duplex filter should be checked to ________.A．determine the need for filter cleaningB．measure any change in oil viscosityC．prevent damage to the filterD．determine the need for batch fil

[单选题]Increasing differential pressure of an oil filter indicates that （）A . it is dirtyB . it is leakyC . it has been renewedD . all the above

[问答题]If increased income is spent on more and larger automobiles, larger houses,

[单选题]The strength of a deck will be increased by adding（）.A . camberB . deck beam bracketsC . hatch beamsD . sheer

[名词解释] differential centrifugation （差速离心）

[名词解释] differential inhibition（分化抑制）

[单选题]E．xpenditure increased on all the following consumption EXCEPT ______.A．) foodB．) automobilesC．) educationD．) entertainment

[单选题]The increased use of computers in business has been_________ by a costly increase in computer crime．A．accompaniedB．disappointedC．matchedD．witnessed

[名词解释] 差分备份（Differential Backup）

[名词解释] 微分反应性 differential reactivity