20÷25=45=1620=128:160=80%;
故答案为:25,16,128,80.
You look very tired and you must have been preparing for the coming examination yesterday evening, _________ you ?
A.didn’t you
B.haven’t
C.weren’t
D.hadn’t
图纸中()是采用直径10mm来绘制的。
A.定位轴线
B.索引符号
C.详图符号
D.指北针
E.都不是