【单选题】If a DC motor runs hot, the cause may be _____.
B.
low ambient temperature
C.
clogged ventilation ducts
D.
an open in the shunt field
【单选题】Bin Laden was killed _____ May 2, 2011. [ ]
【单选题】“创建数组”函数的连接输入启用.输出包含多少个维度?
【单选题】Dear editor, Why do newspapers have so many advertisements for electronic (电子的) equipment? Last Sunday I counted ads. for seven kinds of televisions and thirteen kinds of radios in the Youth Journal. ...
B.
a shop that sells electronic equipment
D.
a hotel where the writer stayed
【单选题】In the past few years the school has ______ a lot of money improving the teaching equipment.
【单选题】If a DC motor runs hot, the cause may be ____.
B.
an open in the shunt field
C.
clogged ventilation ducts
D.
low ambient temperature
【单选题】The DC buses are separated by the DC tie relay. The DC tie relay is normally open, but closes if DC power is lost on either the left or right DC bus. the DC tie relay may be opened by un-latching any ...
A.
the DC buses are connected with each other all the way
B.
the contacts of the DC tie relay are normally open
C.
the DC tie relay is a race between teams in which each member of the team runs or swims one section of the race
D.
un-latching any BTB switch means the BTB switch contacts can not be disconnected
【单选题】Dear editor, Why do newspapers have so many advertisements for electronic (电子的) equipment? Last Sunday I counted ads. For seven kinds of televisions and thirteen kinds of radios in the Youth Journal. ...
B.
a shop that sells electronic equipment
D.
a hotel where the writer stayed
【单选题】(2011·浙江)Experts think that ________ recently discovered painting may be ________ Picasso.