菜点质量具有三个特性内涵，其中“质量要求随技术进步和社会发展而不断变化”是指它的（）。
A、社会性
B、动态性
C、相对性
D、适用性
参考答案：B
（）导向轮的主要作用是调整曳引绳与曳引轮的包角。
__________that no one enjoys__________________.
A．He seems; to be looked down on
B．He is seemed; being looked down upon
C．It seems; to be looked down upon
D．It seems; being looked down upon
