综采工作面顶板破碎时,液压支架应()支护。A、超前 B、滞后 C、及时 D、加强 发布时间:2018-01-24 21:49 │ 来源:www.tikuol.com 题型:单项选择题 问题: 综采工作面顶板破碎时,液压支架应()支护。A、超前B、滞后C、及时D、加强
题型:单项选择题 Nowadays teenagers like to go to the fast food restaurant, ________, as the name says, eating needn’t take much time.A.whichB.howeverC.thereforeD.where 查看答案