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【多选题】
在成熟期企业可以采取的营销策略有（）。A.
适时降价
B.
产品改进
C.
营销组合改进
D.
市场改进
E.
进入新的细分市场
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反馈参考答案：
举一反三
【简答题】理想的安全评价分为 。
【简答题】命题p:三角形的内角和等于180 ,则
【多选题】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 receive 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 multicast group will rece ive it.
F.
A router must be a member of a multicast group to receive multicast data.
【单选题】In the group discussion, they thought up three different __________to solving the environmental problem.
A.
approaches
B.
means
C.
ways
D.
methods
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