A:只含Cu2+、Fe2+、Zn2+
B:只含Zn2+
C:只含Fe2+、Zn2+
D:只含Cu2+、Fe3+、Zn2+
46+37=____
The microphone enabled them to keep in touch,________ it made it convenient for them to contact each other.
读欧洲西部局部地区示意图。圣马洛湾沿岸潮水水位总是比周边地区高,下列说法不正确的是( )