If the monitoring station has good representative, it will hare to follow the principle of the random sampling.
为使监测点具有良好的代表性，必须遵循随机抽样的原则。
Mitch Drew recently took a position as an advertising sales representative at a Canadian TV station where he was formerly a sales manager.
最近，MitchDrew就接受了在一家加拿大电视台当然广告销售代表；他曾经在这家电台担任销售经理。
Mitch Drew recently took a position as an advertising sales representative at a Canadian TV station where he was formerly a sales manager.
最近，MitchDrew就接受了在一家加拿大电视台当然广告销售代表；他曾经在这家电台担任销售经理。
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