下述各图给出的四个并发调度中，哪个不是冲突可串行的？（）
A.
B.
C.
D.
参考答案：B
--- Do you know the boy________ is sitting next to Peter?
--- Yes. He is Peter’s friend. They are celebrating his ________ birthday.
A．who; ninth
B．that; nineth
C．/; nineth
D．which; ninth
羧甲基纤维素钠( )。
A．CMS-NaB．CMC NaC．PVAD．CAPE．PLA
