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【单选题】
关于电弧熄灭的说法是正确的（）。A.
在同样电参数下交流电弧比直流电弧更容易熄灭
B.
熄灭交流电弧常用的是磁吹式灭弧装置
C.
在同样电参数下直流电弧比交流电弧更容易熄灭
D.
气隙内消游离速度小于游离速度电弧一定熄灭
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【单选题】Local bus can reduce the occupation time of CPU. For the EISA local bus, commonly the time can be reduced to ( ).
A.
46％.
B.
265
C.
12％.
D.
6％.
【单选题】Local bus can reduce the occupation time of CPU.For the EISA local bus, commonly the time can be reduced to
A.
42%.
B.
22%.
C.
12%.
D.
2%.
【单选题】Local bus can reduce the occupation time of CPU.For the PCI local bus, commonly the time can be reduced to
A.
46%.
B.
26%.
C.
16%.
D.
6%.
【单选题】Recycling has become the first choice for the disposal of rubbish because_____.
A.
local governments find it easy to manage
B.
recycling has great appeal for the jobless
C.
recycling causes little pollution
D.
other methods are more expensive
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