该图为某市区空气污染的空间分布形态和该市4月份气温垂直分布图。回答3~4题。 污染物密度以粒子 mg/m3 3.根据“空气污染的空间分布形态图”,分
工业革命后社会生产力飞速提高,从本质上说明了 A、资本主义工业文明战胜封建主义农业文明是一大进步 B、工业革命使工人生产积极性倍增 C、资本
How can I fight laziness? Lazy people will never amount to anything in life. However, laziness can be defeated once a few changes have been made in your mind. ___36____ . Many people
电源是提供_________的装置,要使一段电路中产生电流,它的两端就要有_________,同时电路要_________。
化学用语是国际通用的化学语言,下列有关说法正确的是 A. 2H表示2个氢分子 B. 镁离子的符号为Mg2+ C. O2中氧元素的化合价为-2价 D.
What is the nature of the scientific attitude, the attitude of the man or woman who studies and applies physics, chemistry, geology, engineering, medical or any other science? We all know that sc
为了了解小学生的体能情况,抽取了某校一个年级的部分学生进行一分钟跳绳次数测试,将取得数据整理后,画出频率分布直方图(如图4).已知图中从