【单选题】命题公式的主范式包括主()范式和主合取范式两种。
【判断题】命题公式的主范式包括主析取范式和主合取范式两种。
【单选题】your moving out of the twenties, we are giving you a marvelous birthday party.
【单选题】We have opened an L/C in your favour ()the amount of RMB¥ 20 000.
【单选题】The insects would devour all our crops and kill our flocks and heads, if _____ for the protection we get from insect-eating animals.