单项选择题

下列对象执行偏移“offset”命令后，大小和形状保持不变的是（）。
A、椭圆
B、圆
C、圆弧
D、直线

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硬件地址是物理层和数据链路层使用的物理地址，而IP 地址是网络层使用的逻辑地址。

答案：网际组管理协议（IGMP）

单项选择题

Which of the following is a drawback of the payback period method of investment appraisal?

A．It is profit based
B．It considers the time value of money
C．It is cash flow based
D．It doesn't measure the potential impact on shareholder wealth