【单选题】If the contacts of a motor starter or controller fail to drop out when the 'stop' button is depressed the _____.
A.
contacts are carrying excessive current
B.
contacts have become welded together
C.
shading coil is broken
【单选题】Motor controller or starter contacts may become welded together if the contacts _____.
A.
open too quickly and arc
B.
close under excessive pressure
C.
open or close too quickly
D.
close under excessive starting current
【单选题】Motor controller or starter contacts may become pitted and welded together if the contacts _____.
A.
open under loaded conditions
B.
close slowly with light pressure
C.
open too quickly and arc
D.
close quickly with proportionate pressure
【单选题】在党的八大上所做的发言中,陈云提出了()的重要意见,受到重视,为大会决议所采纳。这是探索我国经济体制改革的尝试。
【单选题】Motor starter or controller contacts may become welded together if the contacts ( )
A.
open too quickly and arc
B.
close under excessive pressure
C.
open or close too quickly
D.
close under excessive starting current
【单选题】The cake she made tastes ________ .