下列各物质中,跟溴水、酸性高锰酸钾、氢氧化铜、碳酸氢钠都可发生反应的是()
A. 石炭酸
B. 丙烯
C. 丙烯酸
D. 甘油
E. 丙醇
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接触网作业车工作票是作业车出车的重要依据,须遵循哪些规定?
玉米制种田母本去雄的原则是()、()、(),去雄方法有()去雄和()去雄。
When you enable port security on an interface that is also configured with a voice VLAN, what is the maximum number of secure MAC addresses that should be set on the port?()
A. No more than one secure MAC address should be set.
B. The default will be set.
C. The IP phone should use a dedicated port, therefore only one MAC address is needed per port.
D. No value is needed if the switchport priority extend command is configured.
E. No more than two secure MAC addresses should be set.
盘点表上至少应包括以下哪些要素()。
A. 货架号
B. 商品编码
C. 生产厂商
D. 商品名称
E. 商品规格