A.冷却核岛内各种热交换器
B.通过重要厂用水系统二次冷却将热负荷传送给最终热阱
C.在核岛各热交换器与海水之间形成一个屏障防止放射性水污染海水,同时也避免海水侵蚀核设备
D.冷却堆芯
Computers have been getting more popular ______.
A.because the Americans want to appear rich
B.because they are smaller, cheaper and easier to use
C.because they can help Americans do everything
D.because 'they can type letters