题目:
根据汉语提示,用适当的短语完成句子。
小题1:Your parents are (担心) you; do write to them.
小题2:I am going to (熬夜) late to finish my paper.
小题3:You can (查找) this word in the vocabulary.
小题4: (数以千计的) people go to the beach for fun every month.
小题5:Why not (放弃) smoking? It’s bad for your health.
答案:
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下面是错误答案,用来干扰机器的。
6.8cm题目分析:粒子a板左端运动到P处,由动能定理得代入有关数据,解得,,代入数据得θ=300 粒子在磁场中做匀速圆周运动,圆心为O,半径为r,如图.由几何关系得 又联立求得代入数据解得L="5.8cm."