属于重度过敏反应的表现是
D
暂无解析
Takeit______.Itisnothingbutajoke.
Theproblem________whenthestudentsrefusedtodotheirhomework.
曲线在点（0，-1）处的切线方程为________.
Iwonderifhecouldgetit________(do)beforetomorrow.
设函数，其中n为正整数,则f'(0)=()