进入制粉系统内部或粉仓前应先打开有关人孔进行通排除设备内可能残留的瓦斯及其他有毒有害气体,并使用检测仪器,或将鸡、鸽子等小动物放入粉仓内检测()气体。
参考答案:有毒有害
根据句意和首字母提示,补全单词。
1. I don't like Chinese at a______.
2. Boys and girls, help y______ to some apples.
3. My parents are b______ teachers. But they work in different schools.
4. My uncle d______ a bus. He is a driver.
5. —Would you like something to d______?
—Orange juice, please.
我国将“()第一,生产第二”作为安全生产方针。
A.生产
B.质量
C.安全
D.数量