问题
单项选择题
下列被称为误差中的（）属于真误差。
A.三角形闭合差
B.距离测量中的倾斜误差
C.角度观测时的瞄准误差
D.水准测量的估读误差
答案
参考答案：A
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下列被称为误差中的（）属于真误差。
A.三角形闭合差
B.距离测量中的倾斜误差
C.角度观测时的瞄准误差
D.水准测量的估读误差
参考答案：A
Wishing to encourage her young son’s progress on the piano, a mother took her boy to a Paderewski concert. After they were , the mother spotted a friend in the audience and walked down the passage to greet her. Seizing the to explore the wonders of the concert hall, the little boy rose and explored his way through a door marked “NO ADMITTANCE.” When the house lights dimmed and the concert was about to begin, the mother returned to her seat and that the child was missing. Suddenly, the curtains parted and spotlights focused on the impressive Steinway on stage. In , the mother saw her little boy sitting at the key-board, picking out Twinkle, Twinkle Little Star. At that moment, the great piano master made his , quickly moved to the piano, and in the boy’s ear, “Don’t quit. Keep playing.” Then over, Paderewski reached down with his left hand and began filling in a bass part. Soon his right arm reached around to the other side of the child and he added a running obbligato (伴奏). Together, the old master and the young novice (beginner) transformed a frightening situation into a wonderfully experience. The audience was strongly . That’s the way it is in life. What we can accomplish (实现) on our own is hardly . We try our best, but the aren’t exactly graceful flowing music. But when we trust in the hands of a Greater Power, our life’s work can be beautiful. Next time you set out to great achievements, listen carefully. You can hear the voice of the Master, whispering in your ear, “Don’t quit. Keep playing.”
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