急性心肌梗死早期特异性最高的酶是( )
A.CKB.CK-MBC.ASTD.LDHE.α-HBDH
参考答案:B
解析: CK-MB在急性心肌梗死时诊断特异性最高。
His sister left home in 1998,and ________ since.
A.had not been heard of
B.has not been heard of
C.had not heard of
D.has not heard of
环境监测质量控制分()质量控制和()质量控制。