在发电机运行氢压下，用于监测发电机内氢气湿度的氢气湿度计，应能在运行氢压下长期运行，且须经0.8MPa历时15min的承压试验（）
参考答案：对
如果两数的差是正数，那么这两个数都是正数。[ ]
(2013·四川南充市一模)My favorite writer is Mo Yan, some of ________ novels have a surprising ending.
A．whom
B．his
C．whose
D．which
