| http://www.w3.org/ns/prov#value | - Thus, to stabilize the position of the gas-liquid interface L under gas-liquid change independently of an environmental change, it is preferable to form a layer having a main fiber array component in almost horizontal direction in an area of the upper end of a communication portion (joint pipe 180 in the case of this embodiment) serving as a joint, more preferably in an area including a portion up
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