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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

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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

In a communication system, which among the following convert messages into packets that can travel across the communication channel?

A. Connection devices
B. Sending and receiving devices
C. Storage devices
D. Secondary devices