一块合金含铜与锌的比为3:4,用此合金制造铜锌之比为1:2的新合金63克。问要加铜还是加锌?加( )克。
加锌,加14克。
The Expo 2010 Shanghai has not only proved to be a great success but also provided a fantastic model for Milan ________ managing and organizing events of this scale.[ ]
A.in need of
B.in terms of
C.in search of
D.in favour of
电动风门执行器应定期进行维护,()不属于维护范围。
A.电气控制
B.机械控制
C.行程检查
D.运动机构