單項選擇題

總骨腳的構(gòu)成為()

A.上半規(guī)管后腳和水平半規(guī)管后腳
B.上半規(guī)管后腳和后半規(guī)管下腳
C.上半規(guī)管后腳和后半規(guī)管上腳
D.水平半規(guī)管后腳和后半規(guī)管上腳
E.后半規(guī)管上腳和水平半規(guī)管前腳

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