揭穿突出煤层应进行远距离放炮或者震动放炮揭开或穿过煤层。 发布时间:2019-08-12 20:44 │ 来源:www.tikuol.com 题型:判断题 问题: 揭穿突出煤层应进行远距离放炮或者震动放炮揭开或穿过煤层。
题型:判断题 A cofferdam is().A.any deck below the main deck and above the lowest deckB.a member that gives fore-and-strengthC.made by placing two bulkhead a few feet apartD.a heavy fore-and-aft beam under the deck 查看答案