【单选题】The pioneers ahead of the main body of troops throw some lightweight, dark colored objests to ______.
A.
cross completely snow-covered landscape
B.
prevent themselves from suffering snow-blindness
C.
let the men behind them see something
D.
warm themselves in the cold
【简答题】If you were older , I ____ you to go
there yesterday .A. will allow B. should allow C. would have allowed D. had allowed
【多选题】一个体系与另一个体系交换能量其形式包括( )
【单选题】3 If you were older, I ____ you to go there yesterday
【简答题】日常维护的三检指:____、____、____ 检查。
【判断题】胃癌的常见并发症有出血、幽门或贲门梗阻、穿孔。
【多选题】一个体系与另一个体系交换能量其形式包括()
【多选题】内能是气体分子各种形式能量的总和,这些能量主要包括( )