A:H13+H12→H24e+n01
B:P94238u→U92234+H24e
C:U92235+n01→B56141a+K3692r+3n01
D:A1327l+H24e→P1530+n01
—Yes, he does.
经过同一平面内A、B、C三点可连结直线的条数为( )