【简答题】设集合M={y|y=-x 2 +1},N={y|y=x+1},M∩N=______.
【简答题】What ers may you face when you surf the Internet?
【单选题】There can be no question about the dangers of heroin use. What may start out innocently enough as a desire to experience a new kind of high may progress with extreme rapidity to an almost continuous t...
A.
won't lead to addiction
B.
will rapidly make the person have a terrible dream
D.
may immediately endanger the existence of the person who tries
【单选题】(单选题)这食品生产经营者违反《食品安全法》规定,造成他人人身、财产或者其他损害的, 依法承担赔偿责任,其财产不足以同时承担民事赔偿责任和缴纳罚款一罚金时( )。
【简答题】设集合M={x| y= x-2 },N={y|y=x 2 ,x∈R},则M∩N等于 ______
【单选题】设集合M与集合N都是点集{(x,y)|x∈R,y∈R},映射f:M→N把M中元素(x,y)映射成N中元素(x+y,x-y),则象(2,1)的原象为 [ ]
【简答题】接上,格劳孔提出三个问题后,阿得曼托斯列举了许多现实生活中的现象,这些现象使人们怀疑,不相信正义。他说了哪些现象?