呈长条状,微弯曲,一端有浅黄色的茎叶残痕。表面黄棕色至棕色,上面有一凹沟,具紧密排列的环状节,节上密生黄棕色的残存叶基,由两侧向根茎上方生长,该药材为
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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