学生贷款的贷款对象一般是( )。

A．实行专业奖学金制度的在校学生

B．无力解决在校学习期间生活费的全日制本、专科在校学生

C．年满18周岁，具有完全民事行为能力的在校大学生、研究生

D．无力支付学费、住宿费和生活费的全日制本、专科学生(含高职生)、研究生和第二学士学位学生

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.

（68）处填（）。

A．sequent

B．contiguous

C．following

D．successive