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【单选题】
关于牙齿发育,以下哪项是错误的A.
牙胚由牙板及邻近的外胚间发育而来
B.
帽状期成釉器细胞分化为3层
C.
牙胚是在成釉器的帽状期形成的
D.
最早形成的牙体组织为釉基质
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知识点：
皮皮学刷刷变学霸
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【单选题】( ) 是根据扭矩与预拉力成正比的关系,先用普通扳手将螺帽逐个拧紧,然后用直接显示或控制扭矩的特制扳手拧到规定的扭矩值,特制扳手事先按规定扭矩值经过标定。
A.
扭拉法
B.
张拉法
C.
转角法
D.
扭矩法
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