砻谷机接通电源后电机不动，若是空载，电机嗡嗡作响，则说明砻谷机中（）。

A、辊子调的过松

B、稻谷将胶辊卡住

C、机件有松动

D、电源至电机接线有问题

Generally speaking, all else being equal, an upward-sloping yield curve can be expected when:（）

A. inflationary expectations are beginning to subside and investors begin to show a preference for more liquid/less risky short-term securities.

B. the supply of long-term funds falls short of demand and investors begin to show a preference for more liquid/less risky short-term securities.

C. inflationary expectations are beginning to subside.