已知命题P:∀x∈R,ex﹣x﹣1>0,则¬P是( )
A:∀x∈R,ex﹣x﹣1<0
B:∃x0∈R,ex0﹣x0﹣1≤0
C:∃x0∈R,ex0﹣x0﹣1<0
D:∀x∈R,ex﹣x﹣1≤0
—Sounds good, but I need to ______ before carrying it out.
下列事件反映出的共同主题是( )
化学实验里,老师给学生准备了如图几种实验装置.
What size do you want? ____
____ ____ ____ the Great Wall?