移动式箱体中心点与地面垂直距离为（）m。
A.0.6-1.0
B.0.6-1.2
C.0.8-1.4
D.0.8-1.6
参考答案：D
The world was deeply ________ with the Green Olympics held in China in 2008.[ ]
A. encouraged
B. offered
C. impressed
D. covered
如图所示，质量位m、电阻为R、边长为L的等边三角形ACD电阻线，在A处用细线悬挂于O点，垂直于ACD施加一个垂直纸面向里的匀强磁场．当磁感应强度按规律B=Kt（K为常数）增强并且正好增大为B0时，CD边安培力是______，细线上的拉力为______．
