当强酸性H型交换器失效时,其出水不宜单独用()进行监督,因为当水源中强酸阴离子改变时,其出水也受影响。
A.pH值
B.电导率
C.Na+
D.H+
参考答案:A
纵膈的上界是()
A.胸廓上口
B.锁骨上元
C.颈静脉切迹
D.胸骨柄
E.胸骨角
No one in the department but Tom and I that the director is going to resign.
A.knows
B.know
C.have known
D.am to know