对维持红细胞的正常生理环境具有极其重要意义的氧化还原体系是()
A.NAD-NADH
B.NADP-NADPH
C.抗坏血酸
D.谷胱甘肽
E.血红蛋白-高铁血红蛋白
参考答案:D
函数f(x)=lnx+2x-6的零点所在区间为[ ]
A、(1,2)
B、(2,3)
C、(3,4)
D、(4,5)
It is obvious to the students ______ they should get well prepared for their future. [ ]
A. as
B. which
C. whether
D. that