下列关于南美洲经济的叙述,不正确的是[ ]
A、能源矿产以石油为主
B、金属矿产以铁、铜、铝土为主
C、农业以经济作物种植为主
D、粮食生产能满足多数国家需要
答案:D
This is a difficult and stressful job, but one _____ you can really help people.
A.that
B.where
C.which
D.of which
汽轮机滑销系统起什么作用?