【单选题】在 100 °C和 25 °C之间工作的热机,其最大效率为
【单选题】---_________ either he or I to host Talent Show in our school this year? --- I have no idea, either.
【单选题】He said he would come . He didn't _______.
【单选题】If Joe' s wife goes to the party, _______.
【单选题】在 100 °C 和 25 °C 之间工作的热机最大效率为 :
【单选题】下列有关干燥的描述哪些是正确的( )
A.
自由水在干燥过程中易于除去,平衡水不易于除去,平衡水不仅与物资性质有关,也与空气状态有关。
B.
在干燥速率曲线中存在着恒速段,其主要是因为表面水的汽化速度大于内部水分向表面的迁移速度。
C.
冷冻干燥机有二大部分组成即真空系统和制冷系统。
【简答题】根据音标写单词。 1.I have a_______['spe??l] friend called Max. 2.She feels [?n'k?mft?bl]when Mary talks to her. 3.Hua Luogeng is ['feim?s]all over the world. 4.My brother wants to be a ['s?u??l] worker when ...