物体运动时,若其加速度大小和方向都不变,则物体[ ]
A一定作曲线运动
B可能作曲线运动
C一定作直线运动
D可能作匀速圆周运动
答案:B
— Do we have to wear our school uniforms tomorrow?
— I think so. We _____ the coming-of-age ceremony in the afternoon. [ ]
A. will be attending
B. have attended
C. attend
D. attended
综合布线系统设计分为工作区子系统、()、()、()、()、()六大子系统