①提高媒介素养,利用互联网完善自我
②学会“信息节食”,不可沉迷于网络
③让谣言止于智者,自觉抵制不良信息
④合理利用网络,享受健康的网络生活
A:①②③
B:②③④
C:①②④
D:①③④
提示:⒈When and where will you go?
⒉How will you get there?
⒊How long will you stay there'?
⒋What will you do there?
⒌Why do you want to do these things there?
My holiday plan
小量程的电流表G和用与此相同的小量程电流表改制成的电流表A,电压表V的内阻分别为RG、RA、RV,它们之间的大小关系是( )
能够使紫甘蓝水变绿的物质,称为____。