Books are made __________ paper while paper is mainly made __________ wood.A.of; ofB.from; fromC.of; fromD.from; of
如图,圆O的半径OB垂直于直径AC,M为OA上一点,BM的延长线交圆O于N,过N点的切线交CA的延长线于P。(1)求证: ;(2)若圆O的半径,OA=OM,求MN的长。
Does John know any other foreign language ___French? A. except B. but C. besides D. beside
下列各组物质的相互关系正确的是( ) A.同位素:1H+、2H-、2H2、2H、3H B.同素异形体:C60、C70、C金刚石、C石墨 C.同系物:CH2O2、C2H4O2、C3H6O2、C4H8O2 D
关于1 mol·L-1的硫酸溶液的下列叙述, 不正确的是() A.1 L该溶液中含溶质98 g B.从10 mL该溶液中取出5 mL后,剩余溶液浓度仍为1 mol·L-1 C.将4.9 g浓硫酸加
下列有关红绿色盲的叙述中,错误的是 A.女儿色盲,父亲一定色盲 B.母亲色盲,儿子一定色盲 C.女儿不色
唐太宗说:“自古皆贵中华,贱夷、狄,朕独爱之如一,故其种落皆依朕如父母。”他在位期间最能体现这一思想的重大举措是 ①与吐蕃和亲,送去谷
Psychology has a new application in the field of medicine. Many doctors, together with their patients, are looking for alternative methods of treatment of physical problems. In large hospitals,