单项选择题

以下关于家系图的描写错误的是
A、夫妻通常男左女右
B、长辈在上，子辈在下
C、同辈中，长者在右，幼者在左
D、夫妇双方的家庭都应包含在内
E、一般可在5-15分钟内完成

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单项选择题

Which of the following would be classified as a fixed cost for the local supermarket? ( )

A．The cost of the boxes of cereal sold in the store.
B．The salary and any overtime paid the store's manager.
C．The rent from the six-year lease for the building the store uses.
D．The Social Security tax the store pays the federal government on the workers' income.

最简单的平面连杆机构为。

答案：正确答案：平面两杆机构；两杆机构