诊断急性心肌梗死常用的血清酶有（）
A.肌酸激酶
B.肌酸激酶同工酶
C.乳酸脱氢酶
D.淀粉酶
E.碱性磷酸酶
参考答案：A, B, C
Which of the following relationships most accurately describes the inefficiency resulting from government imposed production quotas（）
A. Marginal benefit exceeds marginal cost leading to underproduction.
B. Marginal benefit exceeds marginal cost leading to overproduction.
C. Marginal cost exceeds marginal benefit leading to overproduction.
