简述为何肌收缩力与初始肌节长度有关，并解释其内在机制。
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Which IPv6 address would you ping to determine if OSPFv3 is able to send and receive unicast packets across a link？（）
A. anycast address
B. site-local multicast
C. global address of the link
D. unique local address
E. link-local addre
电磁铁，变压器及电动机的铁心是用硬磁材料制造的。
A. 正确
B. 错误
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