下列装料制度中加重边缘效果最明显的是（）。
A．正同装
B．正分装
C．倒分装
D．双装
参考答案：A
In spite of repeated wrongs done to him, he looks _____ to people greeting him.
A．friendly
B．lively
C．worried
D．cold
放纲绞线的滑车的轮槽直径应与线材直径相配合，滑车轮底直径应大于线材直径的（）。
A.5倍
B.10倍
C.12倍
D.15倍
