The connected joints of pipe,usually made of three joints of pipe approximately 90 feet long,racked in the derrick when making a trip are called a ______.
A.
String
B.
Stand
C.
Joint
D.
Standpipe
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【单选题】Who was the first European to find the falls?
【简答题】视频中的基本共射放大器 R B =300 kΩ , R C = 5kΩ,V CC = 12V, U BEQ =0.7 V , β =4 0, 1.画出直流等效电路,估算静态工作点 I BQ , I CQ 以及 U CEQ的值 ; 2.画出微变等效电路,计算 r be 的值; 3.若输出端接 R L = 4kΩ,试求 A u 、 R i 、 R o 的值。 (注意将答案保留整数)