A.用清潔過的手指擦拭 B.用干凈的衛(wèi)生紙擦拭 C.用酒精擦拭 D.用毛巾擦拭
A.850nm B.1310nm C.1550nm
A.3.84Mcps B.5Mcps C.3.6864Mcps D.1.2288Mcps