The manager spoke highly fo such ____ as loyalty,courage and truthfulness shown by his employees.

A．virtues

B．features

C．properties

D．characteristics

根据《宽带光纤接入工程验收规范》，在缆线敷设时，下列说法错误的是（）

A.缆线的型号规格和数量应符合设计要求

B.卡线式成端电缆芯线应留有适当余长

C.电源线与信号线捆扎为一束

D.光纤活动连接器端面应清洁