【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)。
【多选题】成本按经济用途可以分为( )和( )两类。
【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】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.
【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;③y= 6 x ;④y=x 2 +1中,偶函数是______(填出所有偶函数的序号,答案格式如:“1234”).
【单选题】The optimum cross-sectional thickness for an elastomeric impression materials is( )
【单选题】子曰:“君子食无求饱,居无求安。敏于事而慎于言,就有道而正焉。可谓好学也已。”,其中“就”字的含义是?
【简答题】成本按经济用途可以分为( )和( )两在类。
【多选题】以毛泽东同志为核心的党的第一代中央领导集体
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