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铝及其铝合金的焊接性能是什么？

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简述叶轮式给粉机的优缺点。

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违反最大诚信原则的法律后果包括（）

A. 保险人违反说明义务的法律后果
B. 投保方违反告知义务的法律后果
C. 投保方违反保证义务的法律后果
D. 保险人违反保证义务的法律后果

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关于业余无线电台的应急通信是什么？

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The Company LAN switches are being configured to support the use of Dynamic VLANs. Which of the following are true of dynamic VLAN membership？（）

A. VLAN membership of a user always remains the same even when he/she is moved to another location.
B. VLAN membership of a user always changes when he/she is moved to another location.
C. Membership can be static or dynamic.
D. Membership can be static only.
E. None of the other alternatives apply.

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