设
,其中
为任意常数，则下列向量组线性相关的为()
C
________they'vegottoknoweachotheralittlebetter,theygetalongjustfine.
已知函数11sinxfxxx，记0limxafx，(I)求a的值 (II)若x0时，fxa与kx是同阶无穷小，求常数k的值.
SinceWilliamhadbeenseriouslyillforseveralmonths,hisparentswereworriedabout________toreturntoschoolfull-time.
Aftersomanydayswithoutrain,thegroundquickly________thelittlerainthatfelllastnight.
Q表示产量,成本C(Q)=100+13Q，单价p，需求量Q(p)=800/P+3-2则工厂取得利润最大时的产量为_____
