【简答题】在禁火区需做动火作业时,必须取得动火证。做动火分析时,取样与动火的间隔不得超过( )分钟,如超过此间隔或动火作业中间停止作业时间超过( )分钟,必须重新取样分析。
【单选题】Consider a transfer function with a positive real parameter. The maximum value of p until which G(s) remains stable is
【判断题】The maximum value of an indicator with data type U8 is 256.
【单选题】If can change, in oder to let the Zener diode in "on" state, determine the maximum value of .
【简答题】The sum of two real numbers x and y is 12. The maximum value of their product xy= .
【单选题】The maximum value of total angular momentum for electron with l=4 ( )
【单选题】When principle quantum number n=4,what is the maximum value of m l ?