若函数的定义域是[0，2]，则函数的定义域是_____________.
My father enjoys ____ very much. He often practises _____ in summer. A. to swim; swimming B. swimming; swimming C. to swim; to swim D. swimmin
LONDON （Reuters）―Organic fruit, delivered right to the doorstep. That is what Gabriel Gold prefers, and he is willing to pay for it. If this is not possible, the 26-year-old computer technician
古代某一学派曰:“诸侯相爱则不野战,家主相爱则不相篡,人与人相爱则不相贼,君臣相爱则惠忠,父子相爱则慈孝,兄弟相爱则和调。”下列符合这一学派
下列热化学方程式中ΔH表示可燃物标准燃烧热的是( ) A．CO(g)＋O2(g)===CO2(g) ΔH＝－283 kJ·mol－1 B．CH4(g)＋2O2(g)===CO2(g)＋2H2O(g) ΔH＝－802.3 kJ·mol－1 C．2H2(g)
观察下面的漫画，自选角度，写一段鉴赏文字。不超过60字。（画面所题诗句为“小桌呼朋三面坐，留将一面与梅花”）（5分）
关于氧气用途的叙述错误的是 （ ）A．氧气可用于化工生产 B．氧气可用于炼钢
