【单选题】An ideal gas differs from a real gas in that the molecules of an ideal gas __________.
A.
have no attraction for one another
B.
have appreciable molecular volumes
C.
have a molecular weight of zero
D.
have no kinetic energy
E.
have an average molecular mass
【单选题】have an appreciable electrical resistance R that decreases if the temperature rises.
A.
Metals and metallic alloys
D.
Insulating or dielectrics
【判断题】Professor Li, who is my friend, teaches in Peking University.()
【单选题】沙门氏菌食物中毒在食物中毒发生问题上占有重要位置,某地发生一起760人大型食物中毒,报告潜伏期8-24小时,临床症状:恶心,头痛,食欲不振,出冷汗,呕吐,腹泻,腹痛,体温升高达38℃。沙门氏菌食物中毒发热的主要原因是()
【单选题】某三角形的角度闭合差为+12′′,则三个内角的改正数为( )。
【简答题】- Have you rung Professor Li? - Last week I _______ him for our next meeting but I _________. A. rang, forgot B. could have rung, forget C. rang, forget ...
【单选题】I plan to go back home to visit my family during the Spring Festival, but if I can't get the train ticket, I still have an________plan: to visit the museums. [ ]
【判断题】在 Exce12010 中输入简单有规律性的数据时 , 可以使用自动填充快速输入