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问题 多项选择题

双子叶植物的根的性状特征为

A．一般为直根系

B．表面常为栓皮，较粗糙

C．形成层环大多明显

D．中心常无髓

E．自中心向外的放射状结构，木部尤为明显

答案

参考答案：A,B,C,D,E

选择题

-May I come in?  I'm sorry I am late.

-Come in, please. But could you please tell me        ?[ ]

A. what were you doing then

B. why are you late again

C. who you talked with

D. how did you come to school
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单项选择题

常用的软膏剂基质分为

A．油质性基质和水溶性基质
B．油质性基质、水溶性基质和乳剂型基质
C．油质性基质和乳剂型基质
D．水溶性基质和乳剂型基质
E．凝胶性基质和乳剂型基质
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