表面黄白色或灰黄色,有刀削痕,须根的答案
表面黄白色或灰黄色,有刀削痕,须根痕小点状,略呈横向环状排列的药材是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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