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１简要评析 ２０００年全国高考“３＋Ｘ”理科综合卷第３０题是一道力、电综合题，本题是根据《物理教师》编辑部主编的《高三物理教学研究》第１４０页第１４题改编而成的．原题为：“如图１所示，倾角为３０°的直角三角形底边长２ｌ，且处于水平位置，斜面为光滑绝缘导轨，
1 A brief review of the “3+X” Science Comprehensive Question Volume 30 in the National College Entrance Examination in 2000 is a combined force and electricity question. This question is based on the “Questionnaire of Physics Teaching” edited by the editorial department of “Physics Teachers”. of. The original title is: "As shown in Figure 1, the right side of the right-angled triangle with an inclination of 30° is 2 l long and is in a horizontal position. The slope is a smooth insulated rail.