窄渠道
窄渠道-
本研究开发窄渠道肋管及圆管流之热传强化技术。
This research program examined the augmentation methods of heat transfer in the narrow channel and the pipe flow .
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中国的旅行社业分销渠道呈圆桶状，其国际旅行社业务采用长窄的间接渠道，国内旅行社业务采用短窄的直接渠道。
The structure of the distribution channels of Chinese travel service industry is tubby with a relatively short-narrow size and direct channels .
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但也存在着参保对象范围窄，基金筹资渠道少，支付待遇水平低，基金监管不到位，社区卫生服务建设滞后等问题。
But there are also problems like narrow the scope of the insured object , the less fund sources of funding , low pay and poor supervision of funds in place , and community health services building lagged behind .