必须在井下打开牵引部机盖时，需由矿机电部门提出申请，经矿（）批准后实施。
参考答案：机电领导
机体的内环境是指( )
A．体液
B．细胞内液
C．细胞外液
D．血浆
E．组织间液
Which of the following can properly be concluded from the data presented in the graph
