某颗地球同步卫星正下方的地球表面上有一观察者，他用天文望远镜观察被太阳光照射的此卫星，试问，春分那天(太阳光直射赤道)在日落后12 h内有多
某一天，蔬菜经营户老李用了145元从蔬菜批发市场批发一些黄瓜和茄子，到菜市场去卖，黄瓜和茄子当天的批发价与零售价如下表所示： 品名黄瓜茄子
民间传说在一定程度上反映了当时的历史面貌。下侧邮票所体现的古代小农经济的特征是( ) A．男耕女织 B．铁犁牛耕 C．集体劳
Whether we find a joke funny or not largely depends on where we have been brought up．The sense of humour is mysteriously(神秘地)connected with national characteristics．A Frenchman ,for instance
邓小平理论成熟的标志是（ ）A.提出实践是检验真理的唯一标准 B.一国两制的提出C.“南方谈话”和中共十四大召开 D.
Dear Bob, Hello. I learn about you from my English teacher, 1.________Miss Fang. I’d like to your pen friend, and get to 2._________know more about your country. First, let me tell you something m
y=在点A(1,1)处的切线方程是( )A.x+y-2=0 B.x-y+2=0C.x+y+2=0 D.x-y-2=0
下面给划线宇注音完全正确的一项是( )(2分)A．匿名(nì)诘责（jié）鲜为人知(xiān) B．机械(jiè)广漠(mò)茅塞顿开(sè) C．干涸(hé)捕获(pǔ)惩恶扬
