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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】大型设备包括卧式、立式车床、加工件在Ø（）以上的卧式车床、刨削宽度在1000mm以上的单臂刨床、龙门刨床等以及单台设备在10t以上的大型稀有机床。
A.
500mm
B.
800mm
C.
1000mm
D.
1200mm