实行双轨学制的国家以()为代表。A.英国 B.美国 C.苏联 D.中国 发布时间:2017-04-08 20:22 │ 来源:www.tikuol.com 题型:单项选择题 问题: 实行双轨学制的国家以()为代表。A.英国B.美国C.苏联D.中国
题型:单项选择题 下列说法正确的是 [ ]A.根据反应5Fe2++MnO4-+8H+=5Fe3++Mn2++4H2O可知,用酸性KMnO4溶液可检验绿矾是否变质 B.根据反应3Cl2+8NH3=6NH4Cl+N2可知,NH3具有还原性 C.根据反应2Al+2NaOH+2H2O=2NaAlO2+3H2↑可知,单质Al具有两性 D.根据反应H3PO3+2NaOH(足量)=Na2HPO3+2H2O可知,H3PO3属于三元酸 查看答案
题型:单项选择题 The split between humans and living apes is thought by some scholars ____ 15 to 20 million years ago.A.to occurB.occurringC.to have occurredD.having occurred 查看答案
题型:单项选择题 如下是A、B、C三种物质的溶解度随温度变化的曲线,据图回答下列问题:(1)用S表示物质的溶解度,在______℃时,A、B、C三种物质溶解度大小关系为S(B)>S(A)=S(C).(2)温度由t1变化到t2时,A、B、C三种物质的饱和溶液中有溶质析出的是______(填“A”“B“或“C“). (3)t3℃时,将90g A溶质加入到1 00g水中,充分搅拌,______(填“能”或“不能”)形成A的饱和溶液. 查看答案
题型:单项选择题 As we are _____ Table Cloth, we should be pleased if you would send us your best quotations.A.in the market forB.on the market forC.entering the market for D.at the market for 查看答案