N次同精度独立观测值的算术平均值的中误差等于各观测值的中误差的根号N倍.
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测量工作中经常会遇到这种情况，一个观测结果同时受到许多独立误差的联合影响，如照准误差、读数误差、目标偏心误差和仪器偏心误差对测角的影响。在这种情况下，观测结果的真误差是各个独立误差的代数和。
A. 对
B. 错
The girl with _______ umbrella in hand is studying in _______ university.
A. a, a
B. a, an
C. an, an
D. an, a
-----Lily is coming by _________ plane tomorrow.-----Let's go to _______ airport to meet her.
A. a, a
B. /, a
C. the, the
D. /, the
结果；后果
A. consequence
B. responsibility
C. behavior
D. award
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