【单选题】Negative dB values represent ______.
C.
power values that do not change
【判断题】测量电流时,要根据电流大小选择适当量程的电流表,不能使电流超出 电流表的最大量程。
【单选题】两级放大电路,Au1= -20,Au2= 50,若输入电压Ui=5mv,则输出电压Uo为(
【简答题】将Na 2 CO 3 ,MgCO 3 ,K 2 CO 3 ,MnCO 3 ,PbCO 3 按热稳定性由高到低排列,顺序为______。
【单选题】.Which of the following is an advantage of using dB representations of gain values?
A.
Positive and negative dB values represent gain and loss values that are reciprocals of each other.
B.
In multistage amplifiers, gain calculations are simplified by the use of dB values.
C.
Using db values, we can represent large gain values with relatively small numbers.
【多选题】Which of the following is an advantage of using dB representations of gain values? ( )
A.
Positive and negative dB values represent gain and loss values that are reciprocals of each other.
B.
In multistage amplifiers, gain calculations are simplified by the use of dB values.
C.
Using db values, we can represent large gain values with relatively small numbers.
【多选题】LTE系统中,对于低优先级频率的小区重选,在满足以下哪些条件后运行?
D.
服务小区S值小于预设的门限,并且低优先级频率小区的S值大于预设的门限,且持续时间超过Treselection。
E.
异频小区重选的对象可以是邻小区列表中的小区,也可以是小区重选过程中检测到的小区。
【单选题】以下哪个参数不用于异系统小区重选控制()。
A.
slntraSearch(小区重选的同频测量触发门限)
B.
sNonintraSearch异频/异系统小区重选测量启动门限
C.
ThreshXHigh异频/异系统高优先级重选门限
【单选题】综合布线系统中,设备间应有足够的设备安装空间,其面积最低不应小于()m2。