传动带在带轮上的包角可以小些，否则容易打滑。
参考答案：错
长期咳嗽并伴有杵状指，最常见于( )
A．支气管癌B．支气管扩张C．支气管哮喘D．胸膜炎E．肺结核
It is NOT advisable to use nylon for alongside towing because it（）.
A.stretches too much
B.is too difficult to make fast
C.parts too readily
D.is too susceptible to mildew
