中日甲午战争中中国的惨败主要原因是武器装备的落后。
参考答案:错
根据语篇情景,用恰当的短语或句子填空,使之意思完整。
Class Nine 1.________________________ on the school trip. They went to Blue Water Aquarium for the day. First they visited the Visitors’ Center and watched a movie about sharks. Then they watched a dolphin show. After that, they went to the Outdoor Pool and saw a big octopus. After lunch, they went to the Gift Shop and 2.____________________________. Finally, tired but happy, they took the bus back to school. At the end of the day, the science teacher 3. __________________ because the class monitor cleaned the bus after the trip.
现欲探究一固体混合物A的成分,已知其中可能含有NaNO3、NH4Cl、CuO、Fe、Cu(OH)2、MgSO4六种物质中的两种或多种.按如图所示进行实验,出现的现象如图中所述(设过程中所有可能发生的反应都恰好完全反应).
试根据实验过程和发生的现象填写以下空白:
(1)气体D能使湿润的红色石蕊试纸变为 色.
(2)固体H的化学式是 .
(3)溶液F中一定含有的酸根离子有(写离子符号) .
(4)根据步骤②你能确定混合物中一定存在的一种物质是 (只写一种,填化学式),你判断的依据是 .
(5)步骤②中生成白色沉淀E的有关反应的化学方程式 .