单项选择题

A、阀:1,3,5,8,9,10,11,14,19,20
B、阀:1,3,4,6,7,8,10,11,13,18,22
C、阀:2,3,5,8,9,10,11,14,19,21
D、阀:2,3,4,6,7,8,9,10,11,14,19,23
E、阀:2,3,5,8,9,10,11,12,15,17,23
F、阀:1,3,4,6,7,8,9,10,11,14,16,20