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