【单选题】Remember:don't touch anything in the laboratory unless the teacher tells you________. [ ]
【单选题】Don’t touch him, for he is a ______person.
【单选题】The paint is still wet___.
A.
Don't he sure to touch it.
B.
Not be sure to touch it.
C.
Be not sure to touch it.
D.
Be sure not to touch it.
【单选题】下列因素对郎伯——比尔定律不产生偏差的是
【单选题】This sign means ______. [ ]
【判断题】在三相四线制中性点接地供电系统中,线电压是指相线之间的电压( )
【简答题】新一代农业气象业务服务系统(省级)系统中,其总系统集成采用________模型技术。