在水准测量中，转点的作用是（  ）。

A、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px">传递方向</span>

B、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px; TEXT-DECORATION: none">传递高程</span></p><p></p>

C、<span style="FONT-FAMILY: &#39;Times New Roman&#39;,&#39;serif&#39;; FONT-SIZE: 14px">A</span><span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px">和</span><span style="FONT-FAMILY: &#39;Times New Roman&#39;,&#39;serif&#39;; FONT-SIZE: 14px">B</span><span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px">都可以</span></p><p></p>

D、<span style="FONT-FAMILY: &#39;Times New Roman&#39;,&#39;serif&#39;; FONT-SIZE: 14px">A</span><span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px">和</span><span style="FONT-FAMILY: &#39;Times New Roman&#39;,&#39;serif&#39;; FONT-SIZE: 14px">B</span><span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px">都不行</span>