电梯钥匙未经业主管理部门人员同意,不得随意使用。因工作需要使用时应做好记录。()
参考答案:对
-Why are you in such a hurry?
-I was told that my mother had been sent to the hospital. I have to leave ________.[ ]
A.before long
B.right now
C.from now on
D.all the time
一台拖拉机对地面的压强是3×104帕,它表示地面每平方米面积上受到的( )
A.压力是3×104牛
B.压力是3×104帕
C.压强是3×104帕
D.重力是3×104帕