筋瘤继发感染形成（）。
A.湿疹
B.臁疮
C.褥疮
D.丹毒
E.流火
参考答案：B
The book is said to the special one, many events not found in other history books.
A．it writes
B．which covers
C．it prints
D．which reads
为什么说实际线性整步电压的最大值、最小值不与相角的零度、180度对应？
