皮皮学，免费搜题
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【单选题】
校工用如图所示的剪刀修剪树枝时,常把树枝尽量往剪刀的轴处靠近,这样做是为了( )A.
增大阻力臂，省力
B.
减小阻力臂，省力
C.
增大动力臂，方便
D.
减小动力臂，方便
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】书p155 4.10
【简答题】阅读理解 [1] I was walking in the park with a friend recently,and his cell phone rang,interrupting our conversation.There we were,walking and talking on a beautiful sunny day.But I became invisible,absent...
【单选题】At the railway station，he waved goodbye to his friend until the train was ________.
A.
out of sight
B.
out of reach
C.
out of order
D.
out of place
【简答题】书p155 4.9
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