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【单选题】
变频器都有多段速控制功能,三菱FR-D700系列变频器最多可以设置()段不同速度运行频率A.
3
B.
7
C.
8
D.
15
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皮皮学刷刷变学霸
举一反三
【单选题】What is the basis for the banking system?
A.
Contract system that can be enforced
B.
People's willingness to deposit money in banks
C.
The possibility that the bank can make profits from its borrowers
D.
The fact that some people have surplus money while some need loans
【单选题】According to the passage, an artist is always trying______.
A.
to interest the public in shapes and colors
B.
to create something difficult for us to understand
C.
to express something new to us
D.
to make show of his unusual abilities
【简答题】下列食物含维生素B1丰富的是（ ）。
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