本煤层巷道抽放瓦斯法抽出的瓦斯浓度高于钻孔抽放瓦斯法。
参考答案:错
根据语境猜测contain 词义。
1) An adult should be able to contain oneself. ____
2)The bowl contained a variety of fruit. _____
3)The auditorium will contain 3,000 people._____
退出短信俱乐部的方式?