将正面分别标有数字1、2、3、4、6,背面花色相同的五张卡片沅匀后,背面朝上放在桌面上,从中随机抽取两张。 ⑴写出所有机会均等的结果,并求抽
You wake up in the morning,the day is beautiful and the plans for the day are what you have been looking forward to for a long time.Then the telephone rings,you say hello, and the drama starts
阅读理解 阅读理解下面的短文,然后按要求答题。 There are twelve months in a year. The names of the twelve months are January, February, March, April, may, June, July, August, Sep
钓鱼岛及其附属岛屿自古以来就是中国的固有领土。近来中国海监船不断在钓鱼岛领海内巡航,逐步使巡航实现常态化。这是通过 ( ) A.行使自卫权维
二战后,美国对欧洲和日本进行经济援助,最重要的目的是 A. “遏制”共产主义力量的发展 B. 扩大海外商品市场 C. 向西欧、日本输出新技
中草药秦皮中含有的七叶树内酯(),它具有抗菌作用。关于七叶树内酯的说法正确的是A.七叶树内酯的官能团只有l种B.1mol七叶树内酯与足量的溴水和
For those who are tired of doing the laundry, Samsung has found an answer: a washing machine that can tell you when your laundry is done via a smartphone app (application) . Strange though it may se
一次性使用的聚苯乙烯材料带来的“白色污染”就是一种较为严重的污染现象。最近研制的一种新型材料能代替聚苯乙烯,它是由乳酸聚合而成的,这