This is my school. There are many trees and flowers in it. It's very beautiful. The teaching building is big and tall. There is a big playground in our school. After 4:30 in the afternoon, many students come to the playground to play football and some students play table tennis in the table tennis room. There are 1,200 students and 25 classes in our school. The students all like to study. The teachers in our school are very good. They help the students to study and the students like them, too

计算：$3\sqrt{\frac{2}{3}}\times \left(-\frac{1}{8}\sqrt{15}\right)÷\frac{1}{2}\sqrt{\frac{2}{5}}$

黄海海战中沉没的致远舰至今已达120年之久，船上的许多珍贵文物已打捞出水。当年下令用自己的军舰致远舰撞击敌人军舰，最后壮烈牺牲的中国海军将领是（　　）