The snubbing valve acts as a one-way restrictor.The above sentence means "缓冲活门实际上起了一个双向限流器的作用。"
A.1
正确答案是B
The snubbing valve acts as a one-way restrictor.The above sentence means "缓冲活门实际上起了一个双向限流器的作用。"
A.1
正确答案是B