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[单选] 6．如下图所示，图中A点处形成的转动副数为_______个。L3kCzBbzcpRBJR8AQpGyRcg2BHISskXoJCUfAGCHYGslHwBCclLPO41KALaCgJqA17yBZSlZuM4Akq+gASk5AsI6Ahlo+QLSFhKvoCAjlA2Sr4AhOUlHvcaFAEQ0JYQQDvwki+A7DSLiCCg5AtAUEq+AECOYBZKvoCEZgkYUHaaTQQQUPJFQEhaxHgioOSLp1y1VhFAQMkXASFpEeOJgJIvnnLVWkUAASVfBISkRYwnAkq+eMpVaxUBBJR8ERCSFjGeCCj54ilXrVUEEFDyRUBIWsR4IqDki6dctVYRQOD/fqT9VEYxlUIAAAAASUVORK5CYII=
发布时间：2024-03-05
0次
a. 2
b. 3
c. 4
d. 1