A:H2RO3
B:H2RO4
C:HRO3
D:HRO4
——What______ bowl of noodles would you like, small, medium or large?——A large bowl of beef noodles, please.
写出下列命题的逆命题、否命题、逆否命题,并指出他们的真假:(1)若xy=0,则x,y中至少有一个是0;(2)若x>0,y>0,则xy>0;
对人文主义核心精神的表述,准确的是