问题
选择题
her blond prettiness,she was smart and helpful.
A．Apart from
B．Except for
C．Along with
D．As good as
答案
答案：A
apart from在此处意为“除……外（尚有）”。
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her blond prettiness,she was smart and helpful.
A．Apart from
B．Except for
C．Along with
D．As good as
答案：A
apart from在此处意为“除……外（尚有）”。
，在t=0时刻以速度
从O点沿y轴正方向进入电场区域，不计粒子重力。求：