是双元红外探测器是把2个性能相同,极性相反的热释电传感器整合在一起的探测器是双元探测器。
参考答案:对
_____ a basketball? [ ]
A. Do you have
B. Are you have
C. Are you
D. Do you are have
一般旱作土壤条件下,铵态氮会很快转化成硝态氮。