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【多选题】
关于晶闸管的方法，下列哪些是正确的（ ）？A.
降低阳极电压直到零
B.
在阳极和阴极之间加反向电压
C.
减小阳级电流使它小于维持正常导通的电流
D.
在阳极和阴极之间加正向电压
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举一反三
【单选题】People were surprised to find that he had the ability to ______ everything he was involved in.
A.
precede
B.
dominate
C.
effect
D.
instruct
【简答题】People were surprised to find that he had the ability to ________ everything he was involved in. A) precede B) dominate C) effect D) instruct
【单选题】People were surprised to find that he had the ability to ______everything he was involved in.
A.
precede
B.
dominate
C.
pervade
D.
denominate
【单选题】For young couples, ____ dog is their kid when they don’t have children.
A.
the
B.
a
C.
an
D.
/
【单选题】《建筑模数统一协调标准》中规定建筑中采用的导出模数分为( )和( )。
A.
分模数、基本模数
B.
扩大模数、分模数
C.
基本模数、扩大模数
D.
水平模数、竖向模数
【简答题】在实际生产中,常常利用连杆机构的 特性来 缩 短回程 时间,从而提高 生产率 。
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