装置停车后安全处理的主要步骤有＿。
A.隔绝
B.置换
C.动火
D.清洗
参考答案：A, B, D
Two –thirds of them died or _______ during the earthquake .
A. was injure B. were injured C. is injured D are injured
通常一个静止站在水平地面上的同学，对地面的压强最接近于（ ）
A．10Pa
B．102 Pa
C．104Pa
D．106 Pa
