断面较平坦,粉性的药材为()
A.香加皮
B.黄柏
C.厚朴
D.桑白皮
E.牡丹皮
参考答案:E
The world is changing fast.I strongly believe that one will easily fall behind _______ he keeps on learning.
A.unless
B.if
C.when
D.as
简析企业分析市场营销环境的意义。