燃烧过程是指混合气在汽缸内()过程.
A.油气混合
B.热能转换机械能
C.做功
D.燃烧放热
参考答案:D
类风湿关节炎关节疼痛的特点为()
A.固定于少数关节,剧烈难忍
B.呈游走性
C.关节痛于活动后减轻
D.多呈不对称性
E.发作急骤
— Do you know _____?
— Next Sunday.
A.what they will do
B.where they will do
C.when they will come here
D.who they will meet