A、<span style="FONT-FAMILY: ; FONT-SIZE: 12pt" lang="EN-US"><em>μ</em></span>
B、<span style="FONT-FAMILY: ; FONT-SIZE: 12pt" lang="EN-US"><em>μ</em></span><span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: " lang="EN-US">/</span><i style="mso-bidi-font-style: normal"><span style="FONT-FAMILY: ; FONT-SIZE: 12pt" lang="EN-US">n</span></i>
C、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/843aea67-2713-4f76-97d6-d1288f4b1074.gif"title="ex_1257294430203_0.gif" alt="ex_1257294430203_0.gif"/>
D、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/840fe198-7aee-40f8-8078-678657201ab3.gif"title="ex_1257294446434_0.gif" alt="ex_1257294446434_0.gif"/>