问题
选择题
I need an apple and two eggs ________breakfast. [ ]
A. for
B. at
C. of
D. to
答案
答案：A
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I need an apple and two eggs ________breakfast. [ ]
A. for
B. at
C. of
D. to
答案：A
=15rad/s。则圆盘边缘上A点的线速度大小v=__________m/s，向心加速度大小a=______m／s2。