方程x+3y=10的非负整数解的个数是( )。
4
On the annual International Volunteers Day, the world ______ the work of millions of people who give their time to help others.
A.abolishes
B.assesses
C.accompanies
D.acknowledges
关于急性心肌梗死乳酸脱氢酶的描述,不正确的是()
A.LD和LD1在急性心肌梗死48~72小时达峰值
B.LD测定对CK恢复的AMI有诊断价值
C.LD升高并非一定是心肌损伤所致
D.大量溶血时LD也升高
E.a-羟丁酸脱氢酶(HBDH)测定与LD同工酶无关