ISO14000系列标准中的主干标准是()
A.ISO14001
B.ISO14004
C.ISO14010
D.ISO14011
参考答案:A
Pratt failed many times but he finally ____ to find a successful way to solve the problem.
A.broke out
B.broke up
C.broke down
D.broke through
计量是实现(),量值准确可靠的活动。
A、量值传递
B、测量统一
C、单位统一
D、定量确认