数轴上表示-5和-2两点间的距离的单位长度是( )
A.-7个
B.-3个
C.3个
D.4个
|-5+2|=3.
故选C.
以下最容易导致脑栓塞的是()
A.主动脉瓣狭窄合并心房颤动
B.心房纤维性颤动
C.主动脉狭窄合并窦性心动过速
D.二尖瓣狭窄合并心房颤动
E.三尖瓣狭窄合并心房颤动
In the ceremony, our headmaster required students to improve our competitive awareness in modern society.
A.we
B.us
C.our
D.ours