直立火道式焦炉可分为哪几种？并说明每种类型结构特点。
在PowerPoint中，在下列（）菜单中可以找到“打包成CD”命令。 ["视图","文件","插入","编辑"]
下列属于自我评定的工具的是（）。 ["优\/缺点平衡表","好恶调查表","职业价值观测评","职位分析法"]
天然气的含水量随着压力的增加而（），随着温度的升高和分子量的增大而（）。 ["增加；减少","增加；增加","减少；增加","减少；减少"]
A victim is coughing and wheezing from a partialobstruction of the airway. An observer should （）. ["perform the Heimlich maneuver","immediately start CPR","give back blows and something to drink","allow the person to continue coughing and dislodge the obstruction on his ow"]
氢气输送系统的开车步骤有哪些？
