单项选择题
A BJT has measured dc current values of IB = 0.1 mA and IC = 8.0 mA. When IB is varied by 100 μA, IC changes by 10 mA. What is the value of the βdc for this device? __
单项选择题 Many children are addicted to computers, so they often _____ their parents and play computer games for hours every day. A. clash B. hinder C. deny D. defy
单项选择题 细菌的一般形态不包括哪一类()
单项选择题 津亏热结型噎膈的最佳选方( )
