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【多选题】
关于牙根的说法，正确的是A.
下颌磨牙有2个牙根
B.
上颌磨牙有3个牙根
C.
切牙和尖牙有1个牙根
D.
牙根嵌入牙槽内，直接与牙槽骨结合
E.
牙根管内无神经、血管和淋巴管通过
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举一反三
【简答题】一个函数的图象关于y轴成轴对称图形时，称该函数为偶函数，那么在下列四个函数①y=2x；②y=-3x-1；③ ；④ 中，偶函数是（ ）（填出所有偶函数的序号）。
【单选题】Which of the following statements is TRUE?
A.
The subjects in a cross-sectional research are not of the same age group.
B.
The methods of study in longitudinal research will not change over time.
C.
Longitudinal research is reliable only in seeking understandings of the effects of early experiences on later development.
D.
Cross-sectional methods are not usually adopted in studying, for example, the changes in intelligence over a thirty-year period.
【单选题】The optimum cross-sectional thickness for an elastomeric impression materials is( )
A.
0．5mm
B.
1．0mm
C.
2．0mm
D.
4．0mm
【单选题】Which of the following is NOT a characteristic of a cross-sectional study?
A.
It is conducted at only one point in time.
B.
It can be exploratory, descriptive, or explanatory.
C.
It concentrates on the changes that take place among a specific sample over a period of time.
D.
It provides a means for studying a large population at the same point in time.
E.
All of these choices are characteristics of the cross-sectional study.
【简答题】成本按经济用途可以分为( )和( )两在类。
【简答题】成本按经济用途可以分为哪几类？
【多选题】以毛泽东同志为核心的党的第一代中央领导集体
A.
成功实现了中国历史上最深刻最伟大的社会变革
B.
为当代中国一切发展进步奠定了根本政治前提和制度基础
C.
为新的历史时期开创中国特色社会主义提供了宝贵经验、理论准备、物质基础
D.
为中国特色社会主义制度的创新和发展提供了重要条件
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