计算2cos60°+tan245°=______.
原式=2×12+12=1+1=2.
目前临床上常用的检测乙型肝炎最常用方法是
A.免疫电镜检测粪便标本中病毒颗粒
B.RIA和ELISA检测患者血清中HBV抗原抗体
C.直接分离培养
D.PCR检测血液中HBV抗原抗体
E.ELISA检测患者血清中HBV抗原
已知有下面过程Private Sub proc1(a As Integer,b As String,Optional x As Boolean)End Sub正确调用此过程的语句是【 】
A.Call proc1(5)
B.Call proc1 5," abe ",False
C.proc1(12,"abe",True)
D.proc15,"abe"