【单选题】In Homer's time, wrestling, discus throwing, the javelin and boxing had been taken in Olympic Games.
【单选题】The phrase 'official vehicles' ( Line 5, Para. 1 ) refers to ______.
A.
automobiles for Olympic officials
B.
automobiles used in official occasion
C.
automobiles that the Olympic participants must drive
D.
automobiles that allowed to bear the Olympic symbol
【单选题】Few people know the fact ______ was not until 1936 that basketball became a regular part of the Olympic Games.
【单选题】孔型设计是型钢生产中必不可少的过程和步骤,孔型按照用途分为延伸孔型、成型孔型、成品前孔型和( )四种。
【单选题】下列关于环境标准的论述,不正确的是()
B.
污染物排放标准是实现环境质量标准的主要手段和措施
【多选题】下列关于标准物质描述正确的是()。
A.
标准物质是具有一种或多种足够均匀和很好地确定了的特性,用以校准测量装置、评价测量方法或给材料赋值的一种材料或物质
B.
按照计量法实施细则的规定,用于统一量值的标准物质不属于计量器具的范畴
C.
有证标准物质是指附有证书的标准物质,其一种或多种特性值用建立了溯源性的程序确定,使之可溯源到准确复现的表示该特性值的测量单位,每一种出证的特性值都附有给定置信水平的不确定度
D.
标准物质有两个明显的特点:具有量值准确性和用于计量的目的