防止软盘感染病毒的有效方法是定期格式化软盘。
参考答案：错
Australian English differs ___ British English ___ that some of the vocabulary has
special meanings.
A．from; in
B．with; in
C．from; except
D．with; except
动力钻具在井口试运转时，必须先开（）试运转。
A、单泵
B、双泵
C、单双泵交替开
D、没要求
