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商业发票中的货物描述,必须与()符,其他一切单据可使用货物统称。

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“湿热证,初起壮热口渴,脘闷懊忄农,眼欲闭,时谵语”,证属()。

发动机起动后在正常工况下运转时,控制点火提前角的信号主要有哪些?

Which two statements about using the CHAP authentication mechanism in a PPP link are true?()

A. CHAP uses a two-way handshake
B. CHAP authentication periodically occurs after link establishment
CHAP has no protection from playback attacks
D. CHAP authentication is performed only upon link establishment
E. CHAP uses a three-way handshake
F. CHAP authentication passwords are sent in plaintext

在车床上精车端面,被加工端面的圆跳动超差主要原因是主轴()过大。

A. 径向跳动
B. 轴向窜动

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