光伏产业价值链有四个环节，分别为（）、硅片生产、电池制造、组件封装。
参考答案：晶硅制备
Because of the heavy foggy weather, we had to _______ the plan of going to Xi’an for the football game by air.
A．conceal
B．delay
C．abandon
D．prevent
B股的交收期和交收制度，实现( )的逐笔交收制度。
A．T+3 B．T+2 C．T+1 D．T+0
