单项选择题

胎儿身长46cm，体重2600g，皮下脂肪发育良好，毳毛明显减少，指（趾）甲已达指（趾）间，根据这些信息推断胎龄是

A．24周末
B．28周末
C．32周末
D．36周末

你可能感兴趣的试题

单项选择题

某电池在 298 K，标准压力下可逆放电时，放出 100 J 的热量，则该电池反应的焓变值DrHm为（）。
A、100 J
B、>100 J
C、<100 J
D、-100 J

单项选择题

Why was Lucy worried?
A、Because she didn’t know how to cope with people at the party.
B、Because she didn’t know how to cope with the coming exam.
C、Because she didn’t know how to cope with her weekends.
D、Because she didn’t know how to cope with the coming holiday.