采用預(yù)抽煤層瓦斯區(qū)域防突措施的,應(yīng)當(dāng)采取措施確保預(yù)抽瓦斯鉆孔能夠按設(shè)計(jì)參數(shù)控制整個(gè)預(yù)抽區(qū)域,應(yīng)當(dāng)記錄( ??) (多選題)
題目信息:
采用預(yù)抽煤層瓦斯區(qū)域防突措施的,應(yīng)當(dāng)采取措施確保預(yù)抽瓦斯鉆孔能夠按設(shè)計(jì)參數(shù)控制整個(gè)預(yù)抽區(qū)域,應(yīng)當(dāng)記錄( ) (多選題)
A.鉆孔位置
B.實(shí)際參數(shù)
C.見(jiàn)煤見(jiàn)巖情況
D.鉆進(jìn)異常現(xiàn)象
答案