单纯性甲状腺肿的主要原因是
A．甲状腺素分泌过程障碍B．甲状腺素合成障碍C．人体对甲状腺素的需要量增加D．缺碘
参考答案：D
路面基层按照现行规范，可分为无机结合料稳定类和粒料类，下列选项不属于无机结合料稳定类的是( )。
A．水泥稳定土 B．石灰稳定土C．石灰工业废渣稳定土 D．水泥工业废渣稳定土
This reflects the priority being attached to economic over political activity, partly caused by a growing reluctance to enter a calling blighted by relentless publicity that all too often ends in destroying careers and reputations.
A. powerfulness B. unwillingness C. renaissance D. apologeticness
