回炉煤气主管压力最低不得低于多少Pa？
参考答案：
回炉煤气主管压力最低不得低于500Pa。
党委（党组）或者组织（人事）部门派出的考察组至少由多少名成员组成？
Tom needs some help_______ his homework. Can you help _______?
A．to; he
B．with; him
C．to; his
D．with; his
