The mechanisms of heat transfer enhancement and pressure drop reduction are analyzed of a new type of rod baffle shell and tube heat exchanger with spiral groove tube bundles.
描述了新型折流杆换热器的强化传热和降低壳层压力降的原理，它与传统折流板换热器相比，传热效率高，材料及能耗小。
A one-gram-per-day reduction in salt consumption results in a small drop of systolic blood pressure of 0.8 mm Hg, she said.
每天减少摄入一克盐能令收缩压降低0.8毫米汞柱。
A one-gram-per-day reduction in salt consumption results in a small drop of systolic blood pressure of 0.8 mm Hg, she said.
每天减少摄入一克盐能令收缩压降低0.8毫米汞柱。
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