用圆规和直尺把直角分成三等份。
参考答案:
向AgNO3、Cu(NO3)2、Zn(NO3)2混合溶液中加入一定质量的铁粉,充分反应后过滤,向滤出的固体中滴加稀硫酸,无气体生成,则滤出的固体中可能含有( )
A.Cu Ag
B.Fe Zn
C.Fe Cu Ag
D.Zn Cu Ag
Maritime Safety Information()International SafetyNet Service and NAVTEX Service.
A.consists of
B.can be received
C.is transmitted by
D.Are made on