计量校准人员有权拒绝任何人迫使其违反计量校准规范(方法),或使用未经考核合格的计量标准进行校准。
参考答案:对
Lawrence Craven, a doctor from the USA, is the author of several published reports, one of ________
introduced the idea in 1953 ________ aspirin could reduce the risk of heart attacks.[ ]
A. them; when
B. which; that
C. what; that
D. which; when
混合气体总压力等于各组分气体分压力之()。
A.和
B.积
C.差
D.商
E.都可以