以下哪种类型的道岔不属于单式道岔？ (      )

A、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-ascii-font-family: ">交分道岔</span><span style="FONT-FAMILY: ; FONT-SIZE: 10.5pt" lang="EN-US"><span style="mso-tab-count: 2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>

B、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-ascii-font-family: ">三开道岔</span><span style="FONT-FAMILY: ; FONT-SIZE: 10.5pt" lang="EN-US"><span style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>

C、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-ascii-font-family: ">单开道岔</span><span style="FONT-FAMILY: ; FONT-SIZE: 10.5pt" lang="EN-US"><span style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>

D、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-ascii-font-family: ">双开对称道岔</span><span style="FONT-FAMILY: ; FONT-SIZE: 10.5pt">&nbsp;</span>

E、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: ">以上都不属于</span>