当x→0时下列无穷小中阶数最高的是

A k≠1 B k>1 C k>0 D 与k无关

A 极限不存在． B 极限存在，但不连续． C 连续，但不可导． D 可导．

A <img width="102" height="22" src="https://www.beizhujiaoyu.com/uploads/202208/20210917235553_5385.jpg" /> B <img width="102" height="23" src="https://www.beizhujiaoyu.com/uploads/202208/20210917235555_4916.jpg" /> C <img width="106" height="22" src="https://www.beizhujiaoyu.com/uploads/202208/20210917235555_6947.jpg" /> D <img width="106" height="23" src="https://www.beizhujiaoyu.com/uploads/202208/20210917235557_6948.jpg" />

A 若m<n，则方程组AX=b一定有无穷多个解 B 若m>n，则方程组AX=b一定有唯一解 C 若r(A)=n，则方程组AX=b一定有唯一解 D 若r(A)=m，则方程组AX=b一定有解

A 1，0，-2． B 1，1，-3． C 3，0，-2． D 2，0，-3．

A f=<img width="122" height="38" src="https://www.beizhujiaoyu.com/uploads/202208/20210917235456_5084.gif" /> B f=2<img width="94" height="62" src="https://www.beizhujiaoyu.com/uploads/202208/20210917235458_5608.gif" /> C f=<img width="122" height="38" src="https://www.beizhujiaoyu.com/uploads/202208/20210917235458_7573.gif" /> D f=2<img width="140" height="62" src="https://www.beizhujiaoyu.com/uploads/202208/20210917235500_7744.gif" />

A 相关且相互独立 B 不相互独立但不相关 C 不相关且相互独立 D 相关但不相互独立

A <img width="78" height="47" src="https://www.beizhujiaoyu.com/uploads/202208/20210927234242_9319.jpg" /> B <img width="81" height="47" src="https://www.beizhujiaoyu.com/uploads/202208/20210927234244_5112.jpg" /> C <img width="80" height="47" src="https://www.beizhujiaoyu.com/uploads/202208/20210927234245_0569.jpg" /> D <img width="83" height="47" src="https://www.beizhujiaoyu.com/uploads/202208/20210927234246_6507.jpg" />

A <img width="30" height="42" src="https://www.beizhujiaoyu.com/uploads/202208/20210927234206_7601.gif" /> B <img width="116" height="47" src="https://www.beizhujiaoyu.com/uploads/202208/20210927234249_3381.jpg" /> C 0 D <img width="152" height="47" src="https://www.beizhujiaoyu.com/uploads/202208/20210927234250_8850.jpg" />