可控整流电路输出直流电压可调，主要取决于晶闸管触发脉冲的（）。
A.幅值
B.移相
C.形状
D.脉宽
参考答案：B
--- Not everything that is best for nature is good for people.
--- Yes, would anyone say that economic development should be stopped ______ nature?
A．in need of
B．in fear of
C．in favor of
D．in honor of
最常见的银屑病类型是
A．红皮病型
B．脓疱型
C．关节病型
D．泛发型
E．寻常型
