（）条文同《克莱顿法案》有关。

A．供应价格歧视 

B．搭售和兼并 

C．连锁关系 

D．价格兼并

If a hydraulic pump on a winch accidentally stops while hoisting,the load will stay suspended because（）.

A.a check valve will close that prevents reverse circulation

B.a centrifugal counterweight counteracts the force of gravity

C.the electric pump motor cut out

D.the control lever will move to the stop position