要涂色的面积是多少?
下列说法中正确的是()
Could you please_____ the piano so loudly? Your brother is having a rest now.
①Cu ②KCl ③NaHSO4④SO3⑤H2SO4⑥C2H5OH(酒精)⑦CaCO3⑧BaSO4⑨Cu(OH)2⑩Fe(OH)3⑪NaOH⑫CaO
请按下列要求回答(填写物质的标号):