A:n(烧碱)<n(稀硝酸)<n(盐酸)
B:n(烧碱)<n(盐酸)<n(稀硝酸)
C:n(稀硝酸)<n(烧碱)<n(盐酸)
D:n(盐酸)<n(稀硝酸)<n(烧碱)
—I ______ twenty yuan on it. It was 50% off.
小红同学在做“探究电磁铁”实验中,使用两个相同的大铁钉绕制成电磁铁进行实验,如图所示,下列说法正确的是( )