腐蚀性物质可分为()、碱性腐蚀性物质、其他腐蚀性物质3类。
参考答案:酸性腐蚀性物品
下列算式中,与a-b-c的值不相等的是[ ]
A.a-(b-c)
B.a-(b+c)
C.(a-b)+(-c)
D.(-b)+(a -c)
根据句意用所给词的适当形式填空。
1. —Do you know the ________ (interview) on TV? —Of course. He's Shui Junyi from CCTV.
2. The doctors didn't know what caused the old man's ________ (blind).
3. Can I have a ________ (medicine) examination today? I don't feel well.
4. —How is Miss King? —She is still under________ (treat) in hospital.
5. Dr. Brown felt tired because he had two________ (operate) in the day.