乳化炸药主要用于露天矿山有水深孔爆破。
Which of the following statements is true concerning any evaporator?（） ["High conductivity of the distillate indicates distillate salinity is excessive","Increasing the absolute pressure of the shell will increase the distillers capacity","Mesh separators are used in evaporators to filter the distillate","Reducing the brine density will reduce the heat lost overboard"]
在PowerPoint 2003中，要从当前幻灯片开始放映，应（）。 ["使用“Ctrl+F5”快捷键","单击“幻灯片放映”菜单的“观看放映”命令","单击“视图”菜单的“幻灯片放映”命令","单击“从当前幻灯片开始幻灯片放映”按钮"]
禁止爆破作业人员穿化纤衣服。
经济合理剥采比是指经济上允许的最大剥岩量与可采矿量之比。
试述常见砂浆的种类及特点？
