配备1FC5发电机的康明斯发电车中，若需将额定电压调整为380V，则应（）。

A.首先应调大L1电感

B.首先应减小L1电感

C.首先应调大AVR的电压整定值

D.首先应调小AVR的电压整定值

Packet switching is a method of slicing (71) messages into parcels called“packets，”sending the packets along different communication (72) as they become available，and thenreassembling the packets (73) they arrive at their destination．Prior to the development ofpacket switching，early computer networks used leased，dedicated telephone circuits to (74) with terminals and other computers．In circuit—switched networks such as the telephone system，a complete point—to—point (75) is put together,and then communication can proceed．

A．sequence
B．line
C．board
D．circuit