下列关于自行研究开发无形资产的处理，表述正确的有（）。
A. 企业内部研究开发项目开发阶段的支出，符合资本化条件的计入无形资产，不符合资本化条件的计入当期损益
B. 企业内部研究开发项目研究阶段的支出，应当于发生当期计入当期损益
C. 无法区分研究阶段与开发阶段的支出，应当在发生当期费用化
D. 内部研发项目开发阶段的支出，应全部资本化，记人“研发支出一资本化支出”科目
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试述板框式、水平叶片式、烛式三种硅藻土过滤机的优缺点？
光源色（）。
A. 光源的冷暖
B. 光源的色彩
C. 光源的成分
D. 光源的性质
Which three IP multicast group concepts are true?（）
A. If a packet is sent to a multicast group address, the multicast frame contains the source multicast address.
B. A router does not have to be a member of a multicast group to recei ve multicast data.
C. A router must be a member of a multicast group to send to the group.
D. A router does not have to be a member of a multicast group to send to the group.
E. If a packet is sent to a multicast group address, all members of the multic ast group will receive it.
F. A router must be a member of a multicast group to receive multicast data.
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