中速磨煤机存在的主要问题是：对原煤带进的三块—－铁块、木块、石块敏感，运行中容易引起磨煤机振动，石子煤排放量大等故障。
参考答案：对
The popularity of films such as Jurassic Park, a scientist clones several kinds of extinct dinosaurs, proves how the idea struck a mixture of fear and excitement into people’s hearts.
A．which
B．what
C．in which
D．that
葡萄酒酒标上一般应出现的标记有哪些？
