A/D转换方法有以下四种，ADC0809是一种采用（）进行A/D转换的8位接口芯片。
A.计数式
B.双积分式
C.逐次逼近式
D.并行式
参考答案：C
— What do you think of the lecture made yesterday?
— Excellent! _______ you missed such a wonderful lecture?[ ]
A. How is it that
B. Why it was that
C. How was it that
D. When was it that
谚语：“一品官，二品贾。”但《二刻拍案惊奇》却载：“徽州风俗以商贾第一等生业，科第反在次者。”这反映（ ）
A．政府推行重商主义政策
B．宋朝商品经济发展
C．徽商有超前的经商理念
D．商人地位不断提高
