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______ 四大分析：营销环境分析、、、竞争状况分析。

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广告运作的五大环节：、广告策划、、媒介发布和效果测定。______

The Continual Training training is relatively long, generally（） hours

A. 1-2
B. 2-4
C. 4-6
D. 7-9

Variable Speed Training training method can be used to improve the , to develop strength, speed and endurance, and to train the athlete's ability to more flexibly

In general, no matter what intermittent method is used, the interval time should be controlled between 60 and 120 seconds.