测定Na+时,把水样的PH用碱化剂调到10左右的目的是()
A. 消除Mg2+的干扰
B. 消除Ca2+的干扰
C. 消除OH的干扰
D. 消除H+的干扰
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车用压缩天然气瓶的检验周期是()。
A. 每6年一次
B. 每5年一次
C. 每3年一次
D. 每4年一次
Make a comment on Robert Louis Stevenson.
The novel______describes the mental activities of two Dubliners in a single day. This formless, plotless novel records the thoughts, shades and fleeting flashes of the mind.
George Orwell once said he wrote "because there are some lies I want to expose, some fact