做饭时，过度淘洗大米会使得大米中所含的（）大量流失。  A．复合维生素 B．维生素B

She left home, ____ never to come back. [ ]

A. determined

B. determining

C. being determined

D. having determined

酒后驾车是引发交通事故的重要原因。交警对驾驶员进行呼气酒精检测的原理是：橙色的K₂Cr₂C₇酸性水溶液乙醇迅速生成蓝绿色Cr³⁺。下列对乙醇的描述与此测定原理有关的是[ ]

①乙醇沸点低 ②乙醇密度比水小 ③乙醇有还原性④乙醇是烃的含氧化合物

A．②④

B．②③

C．①③

D．①④

线性表的顺序存储结构和线性表的链式存储结构分别是 ______。

A．顺序存取的存储结构、顺序存取的存储结构

B．随机存取的存储结构、顷序存取的存储结构

C．随机存取的存储结构、随机存取的存储结构

D．任意存取的存储结构、任意存取的存储结构

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.

（70）处填（）。

A．limited

B．finite

C．restricted

D．bounded

下列定位方法中，可用于水下地形图测绘的有（）。

A.全站仪定位

B.经纬仪后方交会定位

C.GPS定位

D.水下声学定位