带与带轮之间的打滑主要是（）引起的。
A、带轮直径过小
B、皮带型号不正确
C、传递载荷过大
D、初始张紧力未调好
参考答案：C
一堆煤重80%吨．______．
— It’s getting dark, but Mr. Chen is till at his office.
— No surprise. Who else can _______ he does.
A．do less work than
B．work as hardly as
C．work as hard as
D．be working hardly like
