下图表示人体细胞中四种主要元素占细胞鲜重的百分比,其中表示碳元素的是
A.甲
B.乙
C.丙
D.丁
答案:B
Lawyers often make higher _____ for their work than they should.
A.bills
B.charges
C.prices
D.costs
企业在编制成本计划时,应先编制生产计划,再编制销售计划。