Visitor b: I do want to have a look! Will all the performances be offered there during the Expo?
参观者B:那我一定要去看看!世博期间所有演出都在那儿吗?
B: I know there will be various kinds of troublemakers.
B:我知道会受到各种各样人的骚扰。
A check valve should be installed on return piping if there will be a pressurized return line or the trap drains to an overhead return line (Fig. B).
如果存在一个压力回路,或者疏水阀排放口位于回路管道的上方,则应该安装一个止回阀(图b)。
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