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【简答题】
在等差数列 中， ，则公差d为 .
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】___ protrudes into the hair bulb and provides nutrients for the growing hair.
A.
Hair papilla
B.
Hair follicle
C.
Hair root
D.
Arrector pili muscle
【简答题】The rack protrudes from
both sides and connects to the rods.
【单选题】When the umbilical cord slips through the cervix and protrudes from the vagina before the baby is born, it is called_________.
A.
placenta previa
B.
placentral abruption
C.
uterine rupture
D.
cord prolapse
【判断题】The lower end of the scapular hillock protrudes downward, called the acromion.（ ）
A.
正确
B.
错误
【单选题】When the umbilical cord slips through the cervix and protrudes from the vagina before the baby is born, it is called ________.
A.
placenta previa
B.
placental abruption
C.
uterine rupture
D.
cord prolapse
【单选题】The portion of a hair fiber that protrudes through the skin and is visible to eye is called( )
A.
the hair shaft
B.
the hair root
C.
the hair follicle
D.
the hair papilla
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