提高钢的加热速度可以缩短加热时间（）金属氧化损失。
A、增加
B、不变
C、减少
参考答案：C
He is the lawyer who you took photos _____ you were in the Forbidden City. [ ]
A. when
B. of when
C. where
D. of where
装卸10-12mm的螺丝时，应选用（）mm的活动扳手。
A、100
B、150
C、250
D、300
