【单选题】— There'ssomeone knocking on the door. Who _____it be? — It must be Mary. She promised to be here at 8:00.
【判断题】土壤孔隙度小,土壤湿度大,土壤导热率大。
【单选题】有关土壤热特性的描述,不正确的是( )。
A.
在获得相等的热量下,容积热容量大的土壤,升温多
B.
土壤导热率越大,土壤容积热容量越小,土壤导温率就越大,土壤温度变化越快
C.
热容量随土壤湿度增加而增大,随土壤孔隙增加而减小
D.
土壤导热率随土壤湿度增加而增大,随土壤孔隙度增加而减小
【单选题】---There’s someone knocking on the door. Who _________ it be? ---It must be John. He promised to be here at 8:00.
【单选题】It promised to be a more difficult ____ than might appear at first sight.
【判断题】工件夹紧变形会影响被加工工件表面形状。( )
【单选题】—There's someone knocking on the door.Who it be? —It must be Mary.She promised to be here at 8:00.