When the aft outflow valve is closed , the forward outflow valve _______ a signal to _____
A.full closed. receive, activate B.send, drive C.receive, drive D.send, drive正确答案C
When the aft outflow valve is closed , the forward outflow valve _______ a signal to _____
A.full closed. receive, activate B.send, drive C.receive, drive D.send, drive正确答案C