单项选择题
A.talk then released to listen
B.listen then released to talk
C.both talk and listen
D.ring the station being called
单项选择题 Which of the following statements is true concerning simple parallel resistance circuits?（）
单项选择题 Which of the listed items will stop a motor due to a reduction in voltage and restart it when the voltage is restored to normal?（）
单项选择题 Which of the following statements concerning a simple parallel resistance circuit is correct?（）