急性阑尾炎()
A.McBurney点压痛
B.Murphy征阳性
C.中上腹压痛
D.脐周压痛
E.下腹正中压痛
参考答案:A
光滑斜面的长度为L,一物体自斜面顶端由静止开始匀加速滑至底端,经历的时间为t,则下列说法正确的是( )
A.物体在中间时刻的瞬时速度是2Lt
B.物体运动到斜面中点时瞬时速度是2Lt
C.物体运动到斜面中点所需的时间是t2
D.物体运动到斜面底端的速度是2Lt
It's cold outside. Please tell him ______ her coat. [ ]
A. don't take off
B. not to take off
C. don't put on
D. not to put on