驾驶机动车在冰雪路面怎样跟车行驶?
A.保持较大的安全距离
B.开启危险报警闪光灯
C.不断变换前照灯远近光
D.适时鸣喇叭提示前车
参考答案:A
已知数列{an}的前n项和Sn,对一切正整数n,点(n,Sn)都在函数f(x)=2x+2-4的图象上.
(I)求数列{an}的通项公式;
(Ⅱ)设bn=an•log2an,求数列{bn}的前n项和Tn.
They will have time to cook dinner, but there aren't vegetables in
the fridge. [ ]
A. many ; a lot
B. much ; a lot
C. a lot of; many
D. a lot; much