问题
判断题
截止阀是依靠燃气压力的变化达到开闭或节流的阀门。
答案
参考答案：错
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截止阀是依靠燃气压力的变化达到开闭或节流的阀门。
参考答案：错
Passage Four
What is the main topic of this talk
A．The function and nature of the brain.
B．The function and nature of nerve cells.
C．The five senses.
D．The spinal cord.