只要企业存在固定成本，就存在经营杠杆效应的作用。（）
参考答案：对
解析：
本题考核的是经营杠杆的计量。
改错。
1. — What's this in English?
A B
— It's ruler.
C D
2. — Is this a desk? — Yes, it isn't.
A B C D
3. — Is that your dictionary? — Yes, it's.
4. — And what's this?
A B C
— This is a pencil sharpener.
D
简述燃煤电厂三大主机的作用？
