【简答题】Please summarize Paragraph 3 in your own words in one or two sentences .
【单选题】微溶化合物A 2 B 3 水溶液中,测得B的浓度为3.0×10 -3 ,则微溶化合物A 2 B 3 的溶度积为( )
【单选题】微溶化合物 A 2 B 3 水溶液中,测得 B 的浓度为 3.0×10 -3 mol /L ,则微溶化合物 A 2 B 3 的溶度积为
【简答题】逆变电路中,当 时,称为有源逆变电路,当 时,称为无源逆变电路。欲实现有源逆变,只能采用 电路,当控制角 时,电路工作在 状态;π╱2〈α〈π时,电路工作在 状态。为防止逆变失败,最小逆变角限制为 。
【单选题】Rc in the pipe thread designation represents: (Single option: 10 points)
B.
ylindrical internal thread
C.
Taper external thread mating with cylindrical internal thread
D.
Taper external thread mating with taper internal thread
【单选题】In order to calculate the volume of water flowing through a pipe, it is important to know its speed and ______
A.
the area across the end of the pipe
B.
the length of the pipe
C.
the water pressure in the pipe
D.
the level from which the water falls
【单选题】单项交流调压变压电路带阻性负载时,移相角的调节范围是( )
【单选题】微溶化合物 A 2 B 3 水溶液中,测得 B 的浓度为 3.0×10 -3 mol . L -1 ,则微溶化合物 A 2 B 3 的溶度积为 ( )
【简答题】Please summarize Paragraph 4 in your own words in one or two sentences .
【单选题】A(n) ______________ allows several unrelated processes to use the pipe for communication.