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【单选题】
电机铁芯常采用硅钢片叠装而成,是为了( )。A.
便于运输
B.
节省材料
C.
减少铁心损耗
D.
增加机械强度
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举一反三
【单选题】According to Paragraph 5, why are ozone depletion and the greenhouse effect considered as urgent human disasters? "ozone depletion"是指?
A.
臭氧空洞
B.
臭氧损耗
C.
臭氧层
【简答题】一条公路长 2.4 公里,表示在地图上为1.2 厘米,则该图按比例尺大小分类属于( )地图。
【判断题】Ozone depletion and the greenhouse effect are considered as urgent human disasters because they directly threaten human beings, and their consequences cannot easily addressed.
A.
正确
B.
错误
【简答题】Ozone depletion and the greenhouse effect are human disasters,and they are urgent because they directly threaten humanity and are not easily ___________ (可逆转的,可倒转的).
【简答题】unique flora and fauna Maoritanga biodiversity sustainable development integrated management ozone hole ozone depletion mortality address Maori grievance
【判断题】Preventing the atmosphere—stopping ozone depletion and the greenhouse effect—is an environmental necessity.
A.
正确
B.
错误
【简答题】In paragraph 3, one example showing environmental necessity is preserving the atmosphere — stopping ozone depletion and the ________ effect.
【简答题】erousof ozone depletion contain 、 、and .
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