题目内容

纳税质押自纳税担保书和纳税担保财产清单经税务机关确认和质物移交之日起生效。

A. 正确
B. 错误

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Which of these statements about PIM join messages in classic PIM-SM is correct？（）

A. PIM join messages are sent every 60 seconds to refresh the upstream router’s mroute state for the multicast tree.
B. Routers send a PIM join acknowledgement in response to each PIM join message received from a downstream router.
C. PIM join messages are only sent when the multicast distribution tree is first being established.
D. PIM join messages are sent every three minutes to refresh the upstream router’s mroute state for the multicast tree.

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