按照出血的原因和发生机理可分为()()两种类型。
参考答案:破裂性出血;渗出性出血
We ________ have bought so much food now that Suzie won't be with us for dinner.(2012·江西)
A.may not
B.needn't
C.can't
D.mustn't
地面上第6列第8行的地砖所在的位置为(6,8).______.(判断对错)