氨蒸发器设置液位连锁的目的是防止液氨进入（）出现爆炸事故。
A.漂白塔
B.吸收塔
C.氧化炉
D.压缩机
参考答案：C
His jokes made all of us _____. [ ]
A. laugh
B. laughing
C. to laugh
D. laughed
