A sufficient amount of chain must be veered when anchoring a vessel to ensure（）.
A. the vessel has enough room to swing while at anchor
B. the anchor flukes bite into the ocean bottom
C. there is a sufficient scope of chain to keep the anchor on the bottom
D. there is more chain out than there is in the chain locker
花果山仙人桥相传因有人在此修道成仙而得名，请叙述仙人桥回文诗。
冷藏车送到装车站后，托运人取消托运，只核收变更手续费。是否正确？为什么？
根据传送网分层、分割的原则，以下哪一项不是中国移动传送网的组成部分（）。
A. 省际骨干传送网
B. 省内骨干传送网
C. 城域传送网
D. 本地传送网
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