【简答题】It’s unnecessary to use formal expressions and you can say “hi” or “hello” to greet each other in a business meeting.
【判断题】It’s unnecessary to vary the length and structure of sentences within a paragraph.
【判断题】It’s unnecessary to use formal expressions and you can say “hi” or “hello” to greet each other in a business meeting.
【判断题】在建筑物若干设备间之间,设备间与进线间及同一层或各层电信间之间宜设置干线路由。
【判断题】It’s unnecessary to pay attention to the contrast between the long and short vowels.
【判断题】It’s unnecessary to bring a gift when we visit an American family.