（）双绞线的铝箔层分有4张，分别包裹线对，切断了每个线对间电磁干拢途径
A、F/UTP
B、U/FYP
C、SF/UTP
D、S/FTP
参考答案：B
—Where are you going? —_______.My grandma is ill in it.
A．Shop
B．Hospital
C．Supermarket
D．Cinema
坏血病是缺乏______．
