在中华人民共和国境内生产、销售、使用放射性同位素与射线装置的单位，应当依照国家的法律法规，取得《辐射安全许可证》。
参考答案：对
｜z+3+4i｜≤2，则｜z｜的最大值为（）。
A.3
B.7
C.9
D.5
Alex Burl is an investment advisor at Helpful Investments, a local investment advisory firm. Helpful Investments requires its employees to invest in the same stocks which Helpful Investments recommends to its clients. Helpful Investments also has established strict procedures determining when trades can be executed in its employees' own portfolios to avoid any conflict of interests with its clients. This procedure is most likely in place to help Burl avoid violations of the Standards of Professional Conduct relating to:（）
A. only material non-public information.
B. only priority of transactions.
C. both independence and material non-public information.
