–What a pity! I didn’t attend the lecture given by Dr. Green yesterday. —I _____, either, if my parents hadn’t reminded me. A. wouldn’t B. hadn’t
以下最接近阿伏伽德罗常数的是() A. 2.0L 1.Omol•L﹣1 CH3COOH溶液中的H+离子数 B. 2.0L 1.0 mol•L﹣1CH3COONa溶液中的CH3COO﹣离子数 C
夏天,小明在海水中游泳,上岸后没有及时擦干身上的水, 过一会儿,觉得“发冷”。请对这个现象进行解释。(2分)
The days of having to remember your ID could soon be a thing of the past. The famous tourist town of Wuzhen, China, is now using facial recognition technology to act as its entry pass through the g
Now we all know that there are nine planets in _____ (太阳的) system.
秦统一岭南后,设置了南海郡、桂林郡、象郡,是岭南历史上第一次划分行政区。赵佗任南海郡郡尉,任嚣任龙川县县令。赵佗、任嚣( ) A.定
用天平和烧杯测量盐水质量,若天平平衡时烧杯的质量如图(甲)所示,烧杯和盐水总质量如图(乙)所示.请你根据图填表.
下列各组的两个向量,共线的是( )A.a1=(-2,3),b1=(4,6)B.a2=(2,3),b2=(3,2)C.a3=(1,2),b3=(7,14)D.a4=(-3,2),b4=(6,4)