题目内容

多普勒效应是指()

A. 振动源频率的变化与传播速度的关系
B. 接收体频率的变化与传播速度的关系
C. 超声波长的变化与超声频率的关系
D. 振动源与接收体相对运动时接收频率的变化
E. 超声传播速度的变化与波长的关系

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简述医疗保险基金的主要来源。

根据规定,下列哪些是国内航行船必备的船舶证书或文件() Ⅰ.船舶证书检验簿; Ⅱ.船舶国籍证书; Ⅲ.起货设备检验簿; Ⅳ.国际吨位证书。

A. Ⅰ~Ⅳ
B. Ⅰ~Ⅲ
C. Ⅱ、Ⅲ
D. Ⅰ、Ⅲ、Ⅳ

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A. You should consider enabling and set up Outlook Anywhere.
B. You should consider setting up an Outlook Web App Mailbox policy.
C. You should consider changing Mia Hamm’s mailbox features.
D. You should consider removing Autodiscover record from the DNS zone.

南宁的简称是_____。(五级、四级)

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