A:外加直流电源保护钢闸门时,钢闸门与电源的负极相连
B:铅蓄电池在放电过程中,负极质量增加,正极质量减少
C:锅炉中沉积的CaSO4可用饱和Na2CO3溶液浸泡,再将不溶物用稀盐酸溶解除去
D:t℃时,恒容密闭容器中反应:NO2(g)+SO2(g)⇌NO(g)+SO3(g),通入少量O2,K值及SO2转化率不变
渭上秋夕闲望①
潘阆
秋色满秦川,登临渭水边。
残阳初过雨,何地不鸣蝉。
极浦涵明月,孤帆没远烟。
渔人空老尽,谁似太公②贤?
【注】①此诗作于潘阆早年落拓江湖之时。②太公,即吕尚,相传他垂钓于渭滨溪,周文王和他相遇,谈得极为投机,即拜为师。后帮助武王伐纣灭殷,建立周朝。
用所给单词完成填空。
had was by were with visited brought cooked young saw
Last weekend , it ____ a sunny day . My mother and I ____ my grandparents . We went there ____ bus . We ____ many things . My grandparents ____ very happy when they____ us . Grandma ____ fish . After lunch , I played____ my cousin . He is one year____ than me . We ____a good time .