A:①—降水
B:②—蒸发
C:③—水汽输送
D:④—地表径流
—It's a hard choice. Both of the players are excellent.
关于病毒叙述正确的是( )
9-____=1
9-____=5
9-____=7
9-____=3
9-____=2
9-____=6
9-____=4