解决生产性毒物危害的最有效途径是（）。
A．加强通风措施
B．生产过程的密闭化、自动化
C．作业人员佩戴防毒面具
D．加强健康监护
参考答案：B
The boy asked his father .
A．where it happens
B．when did it happen
C．what did it happen
D．how it happened
While inspecting the client’s chest, the nurse notes that the chest wall contracts on inspiration and bulges on expiration. The nurse suspects which of the following problem from this assessment（）
A. Hemothorax.
B. Flail chest.
C. Pneumothorax.
D. Tension pneumothorax.
