Although common says "good CARDS to play", but the earlier you think dangerous card down, also prevent a principle of blasting.
虽然平常说“好牌先打”，但早一点把你认为危险的牌舍掉，也是防止放炮的一个原则。
Discussing the harmful effect of blasting controlled on the ground to persons and objects. And offering the ways how to prevent it.
讨论了地面控制爆破对人、物的有害效应，并提出了控制爆破的安全与防护措施。
Discussing the harmful effect of blasting controlled on the ground to persons and objects. And offering the ways how to prevent it.
讨论了地面控制爆破对人、物的有害效应，并提出了控制爆破的安全与防护措施。
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