Code of Civil Procedure Article 337

Where the material needed for giving expert testimony is held by the court, the expert witness shall be informed that he/she may use such material. If necessary, the court may, on motion or its own initiative, order a witness or a party to provide material needed by the expert witness for preparing expert testimony.For the purpose of giving expert testimony, an expert witness may move to subpoena tangible evidence or to examine a witness or a party and may, with the court's permission, examine a witness or a party himself/herself; a party may also be heard on such matters.
中文原文 民事訴訟法第337條
鑑定所需資料在法院者,應告知鑑定人准其利用。
法院於必要時,得依職權或依聲請命證人或當事人提供鑑定所需資料。
鑑定人因行鑑定,得聲請調取證物或訊問證人或當事人,經許可後,並得對於證人或當事人自行發問;當事人亦得提供意見。

English translation for reference only; the Chinese text prevails. Not legal advice.