The outer circumference of the dielectric member has a shape spreading from the conical surface side toward the flat surface side.
介电部件的外周面具有从锥面状表面侧向平面状表面侧扩展的形状。
The outer circumference of the dielectric member has a shape spreading from the conical surface side toward the flat surface side.
介电部件的外周面具有从锥面状表面侧向平面状表面侧扩展的形状。
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