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【判断题】
缺少两个定位尺寸的线段（或圆弧）称为连接线段，缺少一个定位尺寸的线段（或圆弧）称为中间线段。A.
正确
B.
错误
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【多选题】For a ceramic compound, what are the characteristics of the component ions that determine the crystal structure?
A.
the magnitude of the electrical charge on each ion
B.
the numer of atoms in ceramic
C.
the relative sizes of the cations and anions
D.
the weight of atoms in ceramic
【多选题】For a ceramic compound, what are the characteristics of the component ions that determine the crystal structure?
A.
the magnitude of the electrical charge on each ion
B.
the number of atoms in ceramic
C.
the relative sizes of the cations and anions
D.
the weight of atoms in ceramic
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