The operation of paralleling two alternators requires the voltages to be _____ and also in phase

A．zero

B．eliminated

C．different

D．equal

[单选题]The operation of _______two alternators requires the voltages to be equal and also in phaseA．parallelingB．series-mountingC．runningD．controlling

[单选题]The two goals of an operation system are( )and efficiency．A．convenienceB．quickC．optimizeD．standardize

[单选题]The two goals of an operation system are（71）and efficiency.（71）A．convenienceB．quickC．optimizeD．standardize

[单选题]The operation between two fuel injections is called a （）.A . turning cycleB . working cycleC . working hourD . working stroke

[单选题]（）is for the operation ordering and the information exchange by internet among the firms. A . order processingB . order makingC . Electronic order systemD . order form

[单选题]The operation of the Internet is closely monitored by the routers. When something unexpected occurs, the event will be reported by the protocol(73)。A．IGMPB．ICMPC．IPD．OSPF

[单选题]controls the operation of the computer and performs it's data processing functions.A．CPUB．Hard diskC．MemoryD．Database system

[单选题]If the operation __ carefully prepared, it would not have been successful.A． was notB． has not beenC． had not beenD． were not

[单选题]controls the operation of the computer and performs its data processing functions．A．CPUB．DiskC．MemoryD．I/O

[单选题]（）is the operation to check the quantity, quality and package of the goods according to the contract and the specific standard.A . InspectionB . ExaminationC . ControlD . Test