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单选题
535、However, the systems are independent and there is no fluid, exchange between them.
A
The systems exchange fluid from each other and so they are independent.
B
However, the systems are independent of each other and they do not exchange fluid.
C
However, the systems depend on each other and they can’t exchange fluid.
答案解析
正确答案：B
解析：
解析:independent 独立的。depend on 依靠,依赖。
