Those constructs include type constraints, length constraints, control types (drop-down list, text input, range), and iterative structures.

那些构造包括类型约束、长度约束、控制类型（下拉列表、文本输入、范围）和迭代结构。

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At last, based on the range of BER, a simple channel adaptive strategy is proposed to control the frame length.

在此基础上，提出了一种简单的基于BER区间划分的帧长控制的信道自适应发送策略。

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Practical result shows that this system is characterized by wide application range, flexible control and high cut to length accuracy. So, it merits spreading and applying extensively.

应用结果表明，该系统具有适用范围广、控制灵活及定尺精度高等特点，具有广泛的推广应用价值。

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