In some countries, very important to be on time. [ ]
A. it
B. it's
C. its
D. that's
答案:B
患腮腺炎时哪些酶可见升高().
A.p-同工酶
B.s-同工酶
C.胰脂肪酶
D.胰蛋白酶
E.糜蛋白酶