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储能电池系统主要由（）组成

A. 模块连接母线
B. 直流开关
C. 电池模块
D. 电池柜

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电网接入系统的组成部分包括（）

A. 模块连接母线
B. 直流开关
C. 变压器
D. 系统控制器

Alloys may be divided into ferrous alloys and ____alloys.

A. disferrous
B. conferrous
C. non-ferrous
D. inferrous

Petrochemicals are chemicals made from the _____ found in petroleum.

A. hydrocarbons
B. electromagnet
C. areospace
D. chromolithograph

He specialize in aeronautics. It is a science of ______.

A. aerolith
B. sailing across the ocean
C. flying in airship
D. the flow of air