( )阶段延续时间越长,说明设备维护保养越好。
A.初期磨损
B.正常磨损
C.急剧磨损
D.使用磨损
参考答案:B
一氧化碳经呼吸道进入血液中,最先受累的脏器是
A.心
B.肺
C.肝
D.肾
E.脑组织
She won the race in the end and this made her ______. [ ]
A. happy
B. to be happy
C. happily
D. to be happiness