The number of the children in the school ________ about three hundred. ________ of them________ from the countryside.A. is; 20 percents; are B. is; 20 percent; are C. are; 20 percent; is D. are;
下列各组词语中，有两个错别字的一组是（ ） A．瞌睡 赦免 囤积居奇 待自闺中 B．倥偬 桑梓 眉青目秀 邈无人烟 C．赊账 搀兑 目不交睫 光阴荏苒
已知向量，将其绕原点逆时针旋转后又伸长到原来的倍得到向量，则 ．
如图14-11-2所示是测量内外电路上电压的装置，电压表V和V′分别测量什么电压?若V、V′的读数分别为1.15 V和0.85 V，电源的电动势为多大?若滑动变阻器所
如右图中的水平桌面足够长，不计托盘质量和滑轮与绳的摩擦．物体A重10N，当物体B重为3N时，物体A向右做匀速直线运动，要使物体A向左做匀速直线运
--- Do you know _____? --- Next Sunday. A. what they will do B. what will they do C. when will they come D. when they will come
已知：如图，正方形ABCD的边长为6，将其绕点A顺时针旋转30°得到正方形AEFG，FG与BC相交于点H.(1)求证：BH=GH；(2)求BH的长．
The thief fell to the ground, his left foot _____ and blood _____ down from his mouth. A. breaking; running B. broken; running C. breaking; run D. broken; run
