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【单选题】
劳动适龄人口指( )。A.
16 岁以上的全部人口
B.
16 岁～60 岁的人口
C.
男16～60 周岁、女 16～55 周岁的全部人口
D.
男16～60 周岁、女 16～55 周岁的具有劳动能力的人口
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皮皮学刷刷变学霸
举一反三
【简答题】( )决定了轨道的方向,引导列车运动的方向。
【单选题】用甲、乙两个滑轮组分别把质量相等的物体匀速提升到相同高度，甲滑轮组的机械效率比乙高，下列叙述正确的是（ ）
A.
甲滑轮组做的有用功较多
B.
乙滑轮组做的额外功较多
C.
甲滑轮组做的总功较多
D.
甲、乙两滑轮组做的总功相同
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【单选题】—Where did you pick up the stamp? —It was at the post office ________ we worked in the summer vacation.
A.
that
B.
where
C.
which
D.
when
【简答题】When the lazy days of summer arrive and the schedule is filled with swimming，camp，and family vacations，it can be a challenge to find time for learning. But kids’ reading skills don’t have to grow cold...
【简答题】小学生英语学习策略包括___,___,___,___,___等。
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