单项选择题

一阶RC高通电路在截止频率处的相位为                     。
A、
B、
C、
D、

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单项选择题
___ is false statement of data.
A．Data is A symbolic record that describes things and can be defined as meaningful entities.
B．Data can be divided into analog data and digital data.
C．What we usually call data that can be entered directly by a computer is analog data.
D．In today's society, the essence of data is the means of production and assets.
问答题
螺杆定量装置对于粒状或小块状物料可能产生磨碎现象，故常用于______物料的定量作业。
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