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10. Ships less than 12m in length are not required to sound the above sound signals, but if the above sound signals are not sounded, other valid sound signals shall be sounded at intervals of not more than 2 minutes at each time.In 2009, Xueershi preschool education began to offer mathematics thinking courses, and in 2011, Mobi Mathematics offered thinking ability training courses to children aged 2-15. In 2017, New Oriental will offer children's mathematics thinking classes to students who are about to enter large classes in kindergartens. This year, New Oriental Bubble Children will also launch mathematics thinking enlightenment picture books for first-year students, which have been used in some school districts this summer. Zhihui School, an elite education school, began to train children's thinking ability for children aged 4-12 in 2014. One-on-one leader also recently launched the discipline thinking quality education brand "Leader Children" for children aged 4-12.2. The node objects in the chain can be flexibly split and reorganized, adding or deleting a node, or changing the location of the node is very simple.The calculateBouns function contains many if-else statements.Deep water torpedoes (fill in the quantity by oneself)