The concatenation of the values of mult2 and mult1 will form the lower 64-bit half of the result, called half1.
mult2和mult1 串接起来就构成了最终结果的低 64位，我们称之为 half1。
When you work with strings with a null value, the result of the concatenation depends on the session Settings.
处理具有空值的字符串时，串联结果取决于会话设置。
When ON is specified, the result of a concatenation operation is NULL when either operand is NULL.
当指定为ON时，如果串联操作的两个操作数中任意一个为NULL，则结果也为NULL。
If the result of the concatenation of strings exceeds the limit of 8,000 bytes, the result is truncated.
如果字符串串联的结果超出8,000字节的限值，则结果将被截断。
Besides the typical PID controlling method, concatenation, feedforward and fuzzy control algorithms are used. As the result, the control functions of the system are efficiently improved.
在控制软件方面除采用经典的PID控制外，还引入了串级、前馈及模糊控制等算法，有效地提高了系统的控制性能。
Besides the typical PID controlling method, concatenation, feedforward and fuzzy control algorithms are used. As the result, the control functions of the system are efficiently improved.
在控制软件方面除采用经典的PID控制外，还引入了串级、前馈及模糊控制等算法，有效地提高了系统的控制性能。
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