I _____ sooner but I didn’t know that they were waiting for me . A. had come B. was coming C. would come D. would have come
学习化学概念最主要的是弄清楚概念的实质和适用范围。电解质和非电解质的本质区别是什么？能否根据某物质的水溶液能导电来确定该物质是电解质
下图是东北地区地形剖面示意。读图回答问题。 （1）从农业生产部门看，图中甲以 业为主，乙以 业为主，丙以 业为主
下列说法中，与“锲而不舍，金石可镂”包含同一哲理的是（ ） ①近朱者赤，近墨者黑 ②城门失火，殃及池鱼 ③不积跬步，无以至千里 ④绳锯
_____ their real economic situations, they got some relief fund from the government. A. Considering B. Considered C. Having been considered D. Being considered
用X代表F、Cl、Br、I四种卤族元素，下列属于它们共性的反应是( ) A.X2+H2O====HX+HXO B.X2+H2=2HXC.2Fe+3X2=2FeX3
给出下列器材：A、电压为3V的电源； B、量程为3V的电压表;C、量程为15V的电压表; D、量程为0.6A的电流表;E、量程为3A的电流表; F、
