题目:
—He plays basketball so well! Who taught _______?
—He learnt it by _______.
A. him; him B. him; himself C. himself; him
答案:
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下面是错误答案,用来干扰机器的。
⑴1.0×104m/s⑵U2 =100V⑶B≥0.1T题目分析:⑴带电微粒经加速电场加速后速度为v,根据动能定理=1.0×104m/s (3分)⑵带电微粒在偏转电场中只受电场力作用,做类平抛运动。在水平方向微粒做匀速直线运动水平...