题目

设随机变量服从正态分布N（）（＞0），若P（X＜0+P（X＜1=1，则的值为（   ）    A．－1              B．－             C．              D．1 答案：C 根据中文、音标或首字母提示及句意写出句子中所缺单词。1. I have a good ___________(记忆力), I can remember things in a short time.2. Jim is unkind, he has few friends, so he often plays ___________ (独自).3. We eat about 27,000 kilos of food ___________ (在---期间) our lives.4. The doctor tried to s___________ the baby's life.5. Don't ___________ /p?: (r)/ the juice over your clothes.6. He is ill, so he feels very ___________ /wi: k/.