Innovative approaches to manufacturing, coupled with the tremendous size of the domestic market, led to the emergence of the United States as an industrial giant.

A．followed by

B．deriving from

C．combined with

D．mixed with

为了使稀介质浓缩后溢流带走的磁性物少，（）磁性物在浓缩机中的沉降。

A.加速

B.减缓

C.阻止

D.防止