变动成本率高的企业,贡献边际率也高,企业的创利能力也强。 ()
A. 对
B. 错
改移河道属于哪种防护
A. 坡面防护
B. 冲刷防护
C. 工程防护
D. 间接防护
Untreated _______ in our blood contains a set of 11 proteins called complement.
A. serum
B. starch
C. fibre
D. carbohydrate
Allapplicantsshouldbeatleast16yearsofageatthecommencementofthiscourse.Theunderlinedword"commencement"canbereplacedby_______.
A. middle
B. end
C. beginning
D. starts