[单选题]若以Q1表示主物料流量(主流量)，Q2表示副物料流量(副流量)，K表示副流量与主流量的流量比值系数，则下列表达式中正确的是(　　)。(有提示性)
A.K=Q1+ Q2
B.K=Q1×Q2
C.K=Q2/Q1
D.K=Q1/Q2

Canada’s premiers (the leaders of provincial governments), if they have any breath left after complaining about Ottawa at their late July annual meeting, might spare a moment to do something, to reduce health-care costs.
They’re all groaning about soaring health budgets, the fastest-growing components of which are pharmaceutical costs.
66. ______.
What to do Both the Romanow commission and the Kirby committee on health care -- to say nothing of reports from other experts -- recommended the creation of a national drug agency. Instead of each province having its own list of approved drugs, bureaucracy, procedures and limited bargaining power, all would pool resources, work with Ottawa, and create a national institution.
67. ______.
But "national" doesn’t have to mean that. "National" could mean interprovincial -- provinces combining efforts to create one body.
Either way, one benefit of a "national" organization would