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刷刷题刷刷变学霸
举一反三
【单选题】Most shoppers know the feeling. You stand in front of piles of organic produce and wonder what those premium prices are buying you over and above what you get from standard foods. Not a lot nutrition-...
A.
do not use naturally produced fertilisers
B.
produce carbon dioxide when removing weeds
C.
use high doses of weed-killer
D.
use too many resources to qualify for organic status
【单选题】检查减振器工作情况时，用手在汽车的四周用力向上或向下扳动，然后突然放开，看上下的振动是否立即停止。如不能，则说明（）已经失效，应予以更换。
A.
悬架臂
B.
螺旋弹簧
C.
减振器
D.
支撑杆