A:200只
B:300只
C:400只
D:500只
The bag _________ on the table is brought in the shop _________ in the east of the city.
有人设计了如下三个反应:
①3FeCl2+4H2O Fe3O4+6HCl↑+H2↑
②2Fe3O4+3Cl2+12HCl 6FeCl3+6H2O+O2
③2FeCl3 2FeCl2+Cl2↑
下列关于蛔虫和猪肉绦虫的叙述中,错误的是( )