能够形成动物水产不良腥臭气味的前身物质是组胺和三甲胺。()
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Whatistheresultofenteringthecommandspanning-treeloopguarddefault?()
A. Thecommandenablesbothloopguardandrootguard.
B. Thecommandchangesthestatusofloopguardfromthedefaultofdisabledtoenabled.
C. Thecommandactivatesloopguardonpoint-to-multipointlinksintheswitchednetwork.
D. ThecommandwilldisableEtherChannelguard.
在酸性环境和冷却存放状态下,可以稳定叶绿色盐的性质。()
我国现代大型集约化肉鸡饲养的生产周期是68天。()