液压挡轮的主要作用是什么？
参考答案：
使轮带在托轮上游动，促使轮带和托轮表面均匀地磨损，延长其使用寿命，同时，保持窑体的直线性，减少无用功率的消耗。
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Which of the following statements describing options is false()
A. A put option gives its holder the right to sell an asset for a specified price on or before the option’s expiration date.
B. A call option will be exercised only if the market value of the underlying asset is more than the exercise price.
C. A put option’s profit increases when the value of the underlying asset increases.
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