若某工作的尚有总时差为（)，则不会影响工期。A．正值B．负值C．零D．零或正值

“380V/220V Y/△” noted on the nameplate of a non-synchronous motor means that .

A.the armature terminals of the motor should be connected in star formation when voltage of power supply is 380

B.the armature terminals of the motor should be connected in star formation when voltage of power supply is 220

C.both A and B are correct

D.the armature terminals of the motor should be connected in reverse ways of A and B

A.2

B.4

C.6

D.8

______ is not a serious disadvantage in life.

A．To be not tall

B．Not to be tall

C．Being not tall

D．Not being tall

______ is not a serious disadvantage in life.

A．To be not tall

B．Not to be tall

C．Being not tall

D．Not being tall

______ is not a serious disadvantage in life.

A．To be not tall

B．Not to be tall

C．Being not tall

D．Not being tall

Which of the followings is NOT the study's disadvantage？

A．It didn't pay much attention to elderly people.

B．It didn't focus on a group targeted by brain-game makers.

C．It didn't take benefits of intense training into consideration.

D．It didn't take the random brain exercise into consideration.

The motor doesn’t work. I’ll call the __________ to check it.

A.Chief Engineer

B.motorman

C.electrician

What is the disadvantage of sulfur dye？

A．It is expensive.

B．The colours available are limited.

C．It doesn't have a long history.