高效液相色谱法分析水中酚类化合物，水样淋洗时，应选（）为淋洗液。
A．碳酸氢钠溶液
B．碳酸钠溶液
C．甲醇
参考答案：A
—What's the reason ______he didn't go to school last week?
—The reason was______ he was ill. [ ]
A. why; that
B. that; because
C. that; that
D. for; what
低压并联电容器装置接线，宜装设下列配套元件( )。
A．短路保护用熔断器
B．过载保护用热继电器
C．操作过电压保护用避雷器
D．晶闸管变流器
