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
Which word of the following doesn't have the same stress as the others?
A. Spanish B. Accept C. Repeat
血小板膜糖蛋白GPⅡa可以与哪种糖蛋白结合（）。
A.GPⅠa
B.GPⅠb
C.GPⅠc
D.GPⅡa
E.GPⅡb
