A、n
B、l
C、<p class="MsoNormal"><span style="mso-spacerun:'yes';font-family:宋体;mso-bidi-font-family:'Times New Roman';
mso-bidi-font-weight:bold;font-size:12.0000pt;mso-font-kerning:0.0000pt;">m</span><sub><span style="mso-spacerun:'yes';font-family:宋体;mso-bidi-font-family:'Times New Roman';
mso-bidi-font-weight:bold;font-size:12.0000pt;mso-font-kerning:0.0000pt;
vertical-align:sub;">s</span></sub></p>
D、m
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