在含盐30%的盐水x千克中,注入20%的盐水y千克,此时盐水中含盐 [ ]
A.(x+y)千克
B.(x﹣y)千克
C.(0.3x+0.2y)千克
D.0.3x千克
答案:C
句型转换。
1. There is a key and some books on the desk. (变为同义句)
A key and some books ______ ______ ______ ______.
2. Let's see the nice garden. (变为同义句)
Let's ______ ______ ______ ______ the nice garden.
3. The girl is eating breakfast. (变为否定句)
The girl ______ ______ breakfast.
4. People are talking about the good news.(就画线部分提问)
______ ______ people ______ about ?
朱砂、炉甘石等采用()粉碎。