A.机器的功率越大,做的功就越多
B.机器的功率越大,做的功就越少
C.机械的功率越大,使用时越省力
D.机器的功率越大,做同样多的功越省时
答案:D
____ you bring _____ to his attention that now students are bearing too heavy a leaming load(负担) ? [ ]
A. Why not; that
B. Why not; this
C. Why don't; it
D. Why don't; what
简述体育教师的工作特点及体育活动的特点。