用钼酸铵分光光度法测定车间空气中五氧化二磷时，五氧化二磷与水生成偏磷酸，加热生成磷酸，如不加热结果偏高。
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下列符号常量的声明中，（）是不合法的。
A. Const a As Single = 1.1
B. Const a As Integer = “12”
Const a As Double = Sin(1)
D. Const a =”OK&rdquo
作颈外动脉结扎时，应仔细鉴别颈内、颈外动脉，主要鉴别依据是颈内动脉位于颈外动脉的内侧深面()
A. 正确
B. 错误
并联电容器组不平衡保护用中性点电流互感器严重漏油时，应开展B类检修，更换漏油的电流互感器。
A. 正确
B. 错误
What does a Layer 2 switch do if it receives a frame with a destination MAC address that is not found in its MAC address table?（）
A. The frame is dropped.
B. The frame is addressed with a broadcast MAC address and sent out all ports.
C. The frame is sent out all ports except the receiving port.
D. An ARP request is sent out all ports except the receiving port.
E. A destination unreachable message is sent back to the source address.
F. None of the above.
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