题目内容

Business meals are multi-tasking jobs which can often turn out to be nightmares. 其中“which can often turn out to be nightmares”是定语从句。

A. 对
B. 错

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If you want to make a lasting impression, it pays to be on your best behavior at any such meal. 句中“pay”的意思是“支付”。

A. 对
B. 错

本章研究了常微分方程初值问题的数值求解方法,主要介绍了两大类方法:和。单步方法又分为、以及,实际应用时,选择合适的方法具有一定的难度,它既要考虑到、,又要考虑到与、。一般来说,单步法中的经典龙格-库塔方法是一种较常用的方法,即具有、与等特点,又具有。但它需要计算函数值的次数较多,故只有在时才能单独使用。当函数较复杂时,经典龙格-库塔方法更适用于。而多步法具有计算函数值值次数少,结果精度高的特点,并且容易估计误差,在进行比较复杂的计算时,推荐使用线性多步法。(局部截断误差、整体截断误差)和是本章两个重要的概念。前者可以用来,并由此构造更高阶精度的公式;后者可以确定,从而保证计算方法的适应性和可靠性。

One of the most dramatic changes in connectivity and communications in the past few years has been _______.

A. widespread use of mobile devices with wireless Internet connectivity
B. chat rooms
C. satellite uplinks
D. running programs on remote computers

In a communication system, which among the following originate and accept messages in the form of data, information, and/or instructions?

A. Communication channel
B. Sending and receiving devices
Connection devices
Data transmission specifications

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