下列哪项不是表证必备的特点()
A.感受外邪所致
B.起病急
C.病位浅
D.病程短
E.必发展为里证
参考答案：E
一个底面是正方形的长方体，把它的侧面展开后，正好是一个边长为12厘米的正方形，这个长方体体积是______立方厘米．
I don't know _____ to do with it. Will you please show me how? [ ]
A. where
B. when
C. how
D. what
