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【判断题】
柴油车烟度计先接通电源,预热30min以上。A.
正确
B.
错误
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举一反三
【简答题】Most teachers praise parent-students for ______.
【简答题】能够限制物体转动的约束为 ,只能限制物体沿垂直于支承面方向移动的支座为 ;
【单选题】听力原文： Most sillgle-Parent families result when a marriage ends in divorce. (29)In most cases the divorced parents decide who will have the children. (30)About 85 percent of the children live with thei...
A.
Father's incorporated.
B.
Divorce Rate.
C.
Single-parent families.
D.
Children's care in single-parent families.
【简答题】What a parent is most concerned with upon the birth of a child is___________
【简答题】能够限制物体转动的约束为()支座,只能限制物体沿垂直于支撑面方向移动的支座为()支座(选填“固定端”、“活动铰”)