The instructions on the bottle are really _______. I can't understand them at all.
A:encouraged
B:various
C:confusing
D:standard
①FeS2 煅烧→ SO3 H2O→ H2SO4
②Al2O3 NaOH(aq)→ NaAlO2(aq) CO2→ Al(OH)3
③NaCl(aq) 电解→ Na O2→ Na2O2
④Fe 稀硫酸→ FeSO4(aq) NaOH(aq)→ Fe(OH)2 空气中灼烧→ Fe2O3
⑤海水 →提取NaCl蒸发 母液 →热空气Cl2 粗溴 Na2CO3(aq)→ NaBrO3NaBr H2SO4(aq)→ Br2.
根据意思写出词语。
①美好的程度差不多____
②忠实地信仰____
③比喻眼光短,见识浅。____
④互相补充,互相配合。____
“早穿皮袄午穿纱,围着火炉吃西瓜”所描述的现象在我国的( )