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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】直接点在产品面的热咀位置加独立运水（3D异型水套或者铍铜镶件），使热咀周圈模具表面温度趋于一致，同时对应的型腔浇口（）位置做冷却水。
A.
正下方
B.
正上方
C.
左边
D.
右边