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【单选题】
用经纬仪测水平角时,由于存在对中误差和瞄准误差而影响水平角的精度,这种误差笑小与边长的关系是()
A.
边长越长,误差越大
B.
对中误差的影响与关,瞄准误差的影响与边长无关
C.
边长越长,误差越小
D.
D .误差的大小不受边长长短的影响
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【单选题】While skyscr offices and elegant apartment blocks remain the public face of most major cities, these cities also have a mass of secret tunnels and hidden pipes below______which keep everything wor...
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【单选题】学前儿童开始能够进行最初的生活自理的年龄阶段是( )
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