发展性评价
Which two statements about using the CHAP authentication mechanism in a PPP link are true?() CHAP uses a two-way handshake。 CHAP authentication periodically occurs after link establishment。 CHAP has no protection from playback attacks。 CHAP authentication is performed only upon link establishment。 CHAP uses a three-way handshake。 CHAP authentication passwords are sent in plaintext。
超保护贸易政策的主张是() 保护幼稚产业。 反对自由化。 顺差有害。 逆差有益。
开始搬运流速
诊断性评价
充装后的气瓶,应检查()是否良好。