Unfortunately, a fire broke out suddenly in his house and burnt all his ________， leaving him nothing but a car.[ ]

A．furniture  

B．fortune

C．possessions  

D．treasure

关于安全阀的作用下面（）的表述不正确。

A.超压时自动开启泄压；

B.泄压时，发出警告声响；

C.压力降到0以后自动回座关闭；

D.安全阀起跳后，降低介质压力的同时必定降低其温度。