【简答题】根据题中信息,写出有关的化学方程式. (1)查获的(化学式是C 21 H 30 O 2 )等毒品常在空气中焚烧销毁. ______. (2)一些豆科植物能将空气中的氮气转化为能被作物吸收的氮的化合物,其反应可看作是氮气、碳、水在根瘤菌的催化作用下生成了氨(NH 3 )和二氧化碳. ______. (3)黑火药是我国古代的四大发明之一,它是硝酸钾、硫粉、木炭粉按一定比例混合而成的.黑火药在密闭容...
【单选题】Exposure of the Official World
A.
the first book to create a variety of images of numerous scholars and intellectuals, the first to openly challenge the idea of academic studies only for the sake of taking official positions.
B.
exposing darkness of the day and denoucing the feudal official system which was the cause of so much dissatisfaction among the people.
C.
giving a detailed description of the economic life of a newly-emerging class of businessmen and other social classes and reveals a moral world that existed in both matrimonial practices and ual relations at the time.
D.
many stories of the book about love affairs between men and foxes, ghosts or demons, which demonstrate youths' yearning for breaking away from the feudal ethical codes and for free marriage.
【简答题】根据所给出的信息,写出符合要求的化学方程式. (1)黑火药是我国古代四大发明之一,它是由木炭、硫粉、火硝(KNO 3 )按一定比例混合而成,爆炸后生成硫化钾、氮气和二氧化碳. (2)绿色植物的秸秆[主要成分是纤维素,其化学式为[(C 6 H 10 O 5 ) n ],在有适当催化剂的作用下,可与水反应生成葡糖糖(化学式为C 6 H 12 O 6 ).葡萄糖在有适当催化剂的条件下,可转化为乙醇(C ...
【单选题】当今社会正处于第三次工业革命,即信息化革命时期,请问物理学中哪一学科得到了极大发展导致信息化革命?( )
【简答题】官方国际储备(official international reserves)
【简答题】(5分)黑火药是我国古代科技四大发明之一,在化学史上占有重要地位,黑火药主要是硝酸钾、硫磺、木炭三者粉末的混合物,在点燃条件下,其化学反应式主要为:KNO 3 +S+C →N 2 ↑+CO 2 ↑+K 2 S 试填下列空白. (1)在黑火药燃烧的反应中,氧化剂为 ,被氧化的物质为 (2)根据化学反应式分析,KNO 3 、S和C恰好完全反应时,它们的物质的量之比为 (3)黑火药燃烧后的固体残留物中...
【简答题】A.administrative B.bureaucratic C.manager D.official
【简答题】音乐的连贯作用又称为 _________ _ 。
【单选题】More than one the people heart and soul.
C.
official has served for
D.
officials have served for