【多选题】影响网络调查问卷有效性的因素有以下几种( )。
【判断题】Alice cannot reserve a table because the restaurant is full.
【简答题】句型转换。 1. Alice has a tennis racket. (改为一般疑问句) ______ Alice ______ a tennis racket? 2. There were some tigers in the mountains (改为否定句) There ______ ______ tigers in the mountains. 3. The twins are of m...
【单选题】The conference organizer has ______about the agenda but cannot provide help for hotel reservations.
【判断题】热敏电阻的温度系数随温度减小而增大,低温时热敏电阻温度系数大,灵敏度高,高温时温度系数小,灵敏度低。()
【判断题】Alice cannot reserve a table because the restaurant is full.
【判断题】热敏电阻的温度系数随温度减小而减小,所以低温时热敏电阻温度系数小,灵敏度高,故热敏电阻常用于低温测量。
【单选题】热敏电阻的温度系数随温度减小而增大,则:
A.
低温时热敏电阻温度系数大,灵敏度低,高温时温度系数小,灵敏度高。
B.
低温时热敏电阻温度系数小,灵敏度低,高温时温度系数高,灵敏度大。
C.
低温时热敏电阻温度系数大,灵敏度高,高温时温度系数小,灵敏度低。
【单选题】下列有关防水材料内容中,哪一项是正确的?( )[1分]
A.
针入度(1/10mm)反映在一定条件下沥青的相对黏度(即条件黏度)