高级进口替代
参考答案:
所谓高级进口替代是指除继续生产替代进口的非耐用消费品外,转而进一步提高所生产的产品档次,包括耐用消费品、中间产品和资本品,并进行原料深加工。
DNA分子中所含的碱基是
A.GCTUB.GACTC.AGCUD.GATUE.TCAU
A transport layer protocol has several responsibilities. One is to create a process-to-process (program-to-program) communication, TCP uses port (1) to accomplish this. Another responsibility of a transport layer protocolis to create a (2) and error-control mechanism at the transport level. TCP uses a sliding(3) protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve(4) control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends (5) of data to the transport layer. It is the responsibility of the transport layer at the sending station to make a connection with the receiver.
空白(4)处应选择()
A.packet
B.time
C.error
D.phase