问题
单项选择题 A1型题
根管口是指（）
A.髓室和根管的交界处
B.根管末端的开口处
C.髓腔的开口处
D.髓室的开口处
E.根管的开口处
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
根管口是指（）
A.髓室和根管的交界处
B.根管末端的开口处
C.髓腔的开口处
D.髓室的开口处
E.根管的开口处
参考答案：A
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| The sun, the moon and the stars are all in the sky. The earth 1 round the sun . And the moon circles (围绕) the earth . The sun is 2 than the moon . It gives us light and heat (热量). When our part of the earth turns 3 the sun, it is day. When our part of the earth turns away 4 the sun , it is night . "Morning" is the time 5 sunrise (日出) and twelve o'clock, the 6 is overhead (当头). It is "noon" . And when the sun sets (日落), it is "evening" . The moon is much smaller than the sun. It 7 bigger only because it is much 8 the earth. It is our nearest neighbour (邻居) in space (宇宙). Sometimes it looks quite bright , but it 9 any light at all. The light on the moon 10 from the sun . It only reflects (反射) the 11 of the sun . The stars look 12 than the sun and the moon . But 13 of the stars are bigger than the sun. 14 look small because they are very far away from 15 . | ||||
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