光面和镜面的饰面板,经清洗凉干后,方可打蜡擦亮。
参考答案:对
Can you tell me ___ which you based your calculation __ detail ?
A.on; in
B.on; at
C.about ;in
D.about; for
一般情况下,对于要求作业效率高、精度高或影响工人的健康、有危险的作业场合,适宜采用机械化系统。( )