A （）is the foundation of the engine, without the support of which the shaft alignment in particular, and engine structure as a whole, would inevitably be lost.

[单选题]A diesel engine cooling water system with a pH factor of 30 indicates a condition of （）.A . slight acidityB . slight alkalinityC . excessive alkalinityD . excessive acidity

[单选题]is the foundation on which applications are built.A．UserB．DisplayC．PrinterD．Operation system

[单选题] (74) is the foundation on which applications are built.74)A．UserB．DisplayC．PrinterD．Operation system

[名词解释] 英译汉：foundation

[单选题]Floods have undermined the foundation of the ancient bridge.A.weakenedB.rea

[单选题]It was ______ the professor regarded with such contempt.A． he whoB． him thatC． him whoseD． those

[单选题]The pilot launches are ________ blue with the “PILOT” in whiteA．paintedB．writtenC．writingD．paint

[单选题]The government is to ban payments to witnesses by newspapers seeking to buy up people involved in prominent cases(C1)______the trial of Rosemary West. In a significant(C2)______of legal controls over the press. Lord Irvine, the Lord Chancellor, will

[单选题]The presentation layer is concerned with the _(71) and semantics of the informationexchanged between two systems． The processes in two systems are usually exchanginginformation in the form. of character (72)-,numbers, and so on． The information shoul

[单选题]The manager__________the appointment with Mr．Brown，because he had an emergency case to deal with．A．canceledB．destroyedC．resistedD．stopped