仅在你需要模算术或需要很大很大的数字时，才使用无符号类型。
Use unsigned types only when you need modulo arithmetic or very very large Numbers.
目标函数自变量的大小由复数的模决定，复数的幅角决定自变量的符号。
The value of independent variables for objective function is determined by modules, and sign …
仪器上的符号表示可提供或测量1000V或更高的电压，包括常模和共模的组合效应。
The symbol on an instrument shows that it can source or measure 1000 volts or more, including the combined effect of normal and common mode voltages.
仪器上的符号表示可提供或测量1000V或更高的电压，包括常模和共模的组合效应。
The symbol on an instrument shows that it can source or measure 1000 volts or more, including the combined effect of normal and common mode voltages.
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