阳离子交换容量以100g粘土所能交换下来的阳离子毫摩尔数来表示,符号为()。
参考答案:CEC
改错。
1. I has five baseballs.
A B C
2. Does they have a computer?
3. Does your brother has a tennis racket?
A B C D
4. — Thanks you very much.
A B
— You're welcome.
C
5. We play the basketball evey day.
6. Her father have a great sports collection.
7. Helen play sports in the morning.
8. Let us to play soccer, please!
9. They not have a tennis ball.
10. That sound good. Let's go.
信用评级通过评级机构设置的(),直观、简洁地标识了受评对象按时偿付债务的风险程度。
A.专门符号
B.评级方法
C.评级制度
D.评级标准