求美者，女性，21岁，因“下巴后缩”要求整形。

为了评估该求美者的颏部发育是否正常，叙述错误的是（）

A.颏点应该位于面部正中线上

B.使用Rickett审美平面，观察鼻尖、唇、颏部三点是否位于此平面上

C.正面观，颏部长度的美学比例是上唇高∶下唇颏高=1∶1

D.鼻底至口裂线∶口裂线至唇颏沟∶唇颏沟至颏下=1∶1∶1

E.下唇和颏部连线上，最凹陷的部位是唇颏沟

The master shall ensure that any seafarers（）are provided with an adequate period of rest.

A.who have performed work for 14 hours

B.who have performed work in a scheduled rest period

C.who have performed work in a scheduled work period

D.who works hard