中国大学MOOC: The central heating system seems to ________. You should call the repairman to check it.

An operating system that allows several processors to perform computation as thesame time is call A: Single program B: Multitasking C: Multiprocessing D: Real time processing

The central heating system seems to ________. You should call the repairman to check it. A: go wrong B: going wrong C: have gone wrong D: having gone wrong

号召 A: call for B: call off C: call on D: call by

【单选题】The workers agreed to ____ the strike if the company would satisfy their demand.  A) call off B) call out  C) call to D) call on  A. call off B. call out C. call to D. call on 

I ______ Chinese to be gracious hosts.: call back|call up|call upon|call with

No one can _________ yesterday. A: call on B: call from C: call back D: call at

I ____ your office on my way to work. A: call at B: call for C: call in D: call on

Their idea was to get us to the strike at once.A. call at B. call off C. call in D. call for

When nurses go into the hospital ward, ______. A: they answer a call with locator badges B: the wireless system begins to function C: staff can watch them through a wall unit D: infrared signals can detect their presence