The improvement of energy efficiency in a restaurant will not only save money,but protect valuable natural resources,too.

If the voltaic efficiency of the battery is 90%, and the coulombic efficiency of the battery is 90%, the roundtrip efficiency of storage in % for the battery is:<br/>______

对于同一系统，环境效率与资源效率关系是（ ）Which of the following describes a right relationship between environmental efficiency and resource efficiency for the same system（ ）? 环境效率与资源效率无关;The environmental efficiency is not related to the resource efficiency|资源效率越高，环境效率也越高;The higher the resource efficiency, the higher will be the environmental efficiency|环境效率恒等于资源效率;The environmental efficiency is always equal to the resource efficiency|资源效率越高，环境效率就越低;The higher the resource efficiency, the lower will be the environmental efficiency

The old French way of life is characterized by ______. A: leisure, elegance, and efficiency B: elegance, efficiency, and taste C: leisure, elegance, and taste D: leisure, efficiency, and taste

It is a verified fact that the higher ____<br/>of a two-stroke engine, the higher _____. A: the engine efficiency…the<br/>stroke/bore ratio B: the stroke/bore ratio…the<br/>engine efficiency C: the bore / stroke ratio…the<br/>engine efficiency D: the engine efficiency…the<br/>bore / stroke ratio

Volumetric efficiency is the ratio of

Production<br/>efficiency ______

生物发光数据定量时应该使用哪种类型？ A: NTF Efficiency NTF效率 B: Radiance(photons)光子数 C: Radiant Efficiency发光效率 D: Efficiency (epifluorescence) 效率（表面荧光）

Which was correct with greater<br/>the incline of a grizzly? ( ) A: efficiency higher B: throughput lower C: no effect D: efficiency<br/>lower

Energy conversion efficiency (η) is the ratio between （      ）and （      ）.