【单选题】给你以下并联监控调压装置的设定参数,3000Pa、3300Pa、4500Pa、5000Pa,主路切断压力应取( )。
【单选题】正压送风机启动后,防排烟楼梯间风压为( )。
【单选题】PA6、 PA66和PA1010的吸水率顺序为( )。
【判断题】小概率事件是指P≤5%的随机事件。( )
【单选题】下列哪个不是设备管理和维修工作中的基本技术( )
【单选题】What does Frost mean when he says in the poem that “The fact is the sweetest dream that labor knows”?
A.
It is only labor that can make a dream a sweet fact.
B.
It is only “the sweetest dream” that can become a fact.
C.
It is only fact that can become “the sweetest dream.”
D.
It is only through labor that “the sweetest dream” can come true or become a fact.
【单选题】当三色基信号的强度相等R = G = B时,屏幕呈现的颜色为( )。