以下人体血/气分配系数,哪项正确()
A.甲氧氟烷10.8
B.地氟烷0.47
C.七氟烷1.4
D.异氟烷1.46
E.恩氟烷2.91
参考答案:B
图中带箭头的直线是带正电的点电荷电场中的一条电场线,在这条直线上有A、B两点,一带电粒子从A点由静止释放后,仅在电场力的作用下运动经过B点,则下列说法正确的是( )
A.A点场强小于B点场强
B.该带电粒子一定带正电
C.A点电势大于B点电势
D.粒子在A点具有的电势能小于B点电势能
The fans are very sorry to hear that famous actor_____ for half an hour. [ ]
A. has left
B. has been away
C. has gone
D. has gone away