气雾剂的组成由哪些组成的
A、抛射剂
B、药物与附加剂
C、囊材
D、耐压容器
E、阀门系统
参考答案：A, B, D, E
This is a picture, that is ________.[ ]
A. other
B. another
C. one
D. it
288. My eldest sister was left these jewels in my grandmother’s deathbed .
A．paper
B．letter
C．words
D．Will
