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【单选题】
环槽下端面过渡磨损后呈倾斜状,会导致活塞环在柴油机运行周期性地( )变形而疲劳断裂。A.
扭曲水平
B.
弯曲水平
C.
扭曲弯曲
D.
胀缩弯曲
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【单选题】What is exciting about the new fuel cells? 查看材料
A.
Their limitless power generation capacity is amazing.
B.
Their limited power generation capacity is a good beginning.
C.
Their limited power generation capacity is the result of great efforts.
D.
Their limitless power generation capacity is a major accomplishment.
【简答题】水体污染包括重金属污染、水体富营养化和__________等方面。
【简答题】Primary cells, secondary cells and cells are three types of cells and batteries. (fuel / solar)
【简答题】There are 3 types of cells and batteries: primary cells, secondary cells, (fuel cells / recharging cells).
【简答题】水体污染越来越严重，怎样防止水体污染呢？（3分）
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【简答题】Primary cells, secondary cells and cells are three types of cells and batteries. (fuel / solar)
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