.Bicycles made in China are cheaper than ________ made in Japan, but almost as good in quality.

A．ones

B．it

C．that

D．those

生产时要保证物流的畅通性，发生物料断料时要及时采取有效措施，石灰石断料应立即（）或（），硅铝质原料和铁质原料断料以上，应减产运行，硅铝质原料和铁质原料断料（）以上时，立即停磨或止料处理。