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问题 解答题

园林师傅们想在一块底是30米、其对应的高是25米的平行四边形的空地上栽小树苗，如果每平方米的空地可栽4棵小树苗，那么一共能栽多少棵小树苗？

答案

30×25×4，

=750×4，

=3000（棵）；

答：一共能栽3000棵小树苗．

判断题

报关企业和进出口货物收发货人均为B类及以上管理类别的，海关按照较低的管理类别实施管理。()
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单项选择题

An analog signal’s characteristic quantity representing data may (66) . at any instant, any value within a continuous (67) . For example, an analog signal may follow continuously the values of another physical quantity representing data.

A discrete signal is composed of (68) elements in time, each element having one or more characteristic quantities which can represent data. Examples of characteristic quantities are amplitude, waveform, (69) , and position in time. A digital signal is a special case of discrete signals, in which data are represented by a (70) number of well-defined discrete values that one of its characteristic quantities may take in time.

（67）处填（）。

A．interval

B．region

C．range

D．compartment
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