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
