问题
单项选择题 A1型题
后牙3/4冠与前牙3/4冠在邻轴沟的预备中主要不同点是（）
A.邻轴沟方向
B.邻轴沟位置
C.预备的车针
D.邻轴沟形态
E.邻轴沟深度
答案
参考答案：A
解析：3/4冠轴沟的方向应与就位道方向一致，在前牙应与唇面切2/3平行，在后牙与牙体长轴平行。
搜题请搜索小程序“爱下问搜题”
后牙3/4冠与前牙3/4冠在邻轴沟的预备中主要不同点是（）
A.邻轴沟方向
B.邻轴沟位置
C.预备的车针
D.邻轴沟形态
E.邻轴沟深度
参考答案：A
解析：3/4冠轴沟的方向应与就位道方向一致，在前牙应与唇面切2/3平行，在后牙与牙体长轴平行。
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| Scientists think that there has been life on Earth for millions of years. However, we haven't found life __1 _ other planets yet. Scientists have discovered many other galaxies in the universe. They are a long way away and their _2_ has travelled for many years to reach us. Scientists have sent _3 of spacecraft to look at other planets in our solar system, and some spacecraft _4_ beyond the solar system. However, no one _5 discovered any life in space yet.
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