俗称“大保单”，是投保人与保险人之间订立的正式保险合同的书面凭证是______
A. 保险单
B. 保险凭证
C. 联合凭证
D. 暂保单
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"Ex-student", "foretell" and "post-election" contain ______.
A. negative prefixes
B. prefixes of degree or size
C. prefixes of time and order
D. locative prefixes
在Linux操作系统中，可以通过命令______显示路由信息。
A. Is route
B. netstat-nr
C. ifconfig-r
D. service traceroute
PKI的基本组件不包括______。
A. 认证机构CA
B. 公开可访问的目录
C. 注册机构RA
D. 证书库
In the idiom "in good feather", we change "good" into "high or full" without changing meaning. This change of constituent is known as ______.
A. addition
B. replacement
C. position-shifting
D. variation
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