线缆标准化工作主要是由哪一协会制定？（）
A、OSI
B、ITU-T
C、EIA
D、IEEE
参考答案：C
Compared with novels, dramas are not told _______ by the authors but acted out by actors on a stage.[ ]
A. directly
B. generally
C. immediately
D. occasionally
对胰腺癌诊断最好的指标是( )
A．CA125B．POA(胰胚胎抗原)和CAl99C．AFPD．CA50E．CA153
