问题
单项选择题
上颌切牙开髓时，应由舌面窝向颈部方位钻入的原因是 （）
A.近一远中径近切嵴处髓腔最宽
B.横切面髓腔呈圆三角形
C.横切面髓腔唇侧比舌侧宽
D.在牙颈部附近髓腔唇一舌侧径最大
E.根管粗、直，根尖孔大
答案
参考答案：D
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上颌切牙开髓时，应由舌面窝向颈部方位钻入的原因是 （）
A.近一远中径近切嵴处髓腔最宽
B.横切面髓腔呈圆三角形
C.横切面髓腔唇侧比舌侧宽
D.在牙颈部附近髓腔唇一舌侧径最大
E.根管粗、直，根尖孔大
参考答案：D
It was the first week of the summer vacation. Dad said to Mike, “Charlie hurt his foot and can’t for two weeks. Can you work with on the boat?” Charlie was Dad’s helper. Mum said, “We know you had plans with your friends, but Dad really needs your .” “Sure, Dad, I would love to,” Mike replied. Dad and Mike left early the next morning. “Fishing is a(n) job,” Mike thought. But he kept working. When he found they were more and more crabs (蟹), Mike was so excited. It was late afternoon when they returned home. Mum had dinner ready for them, but Mike was so tired that he went straight to bed. The next morning Mike’s arms hurt a lot. , he had such a good time with Dad that he decided to keep helping him. The week(s) passed soon. Charlie came back to work. Mike enjoyed being out on the , so he asked, “May I come too?” Dad looked surprised and said, “Sure!” They all jumped the boat and set off to the ocean. The rest of the summer would be great for the three of them.
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