题目内容

nuclearextendedhomosexualspecific genderdistantsocial genderblendedbiologicaldivorcedsingle-parentadoptedgenetically[音频]5. A stepfamily or1family is a family where one parent has children from a previous relationship that are not2 related to the other parent.

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绳子对物体的约束属于（）约束。

活动铰支座的约束力方向是确定的，垂直于支承面指向铰链

A. 对
B. 错

Listen to the expressions of time and put them down in the blanks.

作用在同一物体上的两个力，使物体处于平衡的必要和充分条件是:这两个力大小相等、方向相反、沿同一条直线。

A. 对
B. 错