皮皮学，免费搜题
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【单选题】
下列有的生殖与发育的叙述正确的是?
A.
人的发育起始于婴儿的出生。
B.
精子与卵细胞在子宫内完成受精作用。
C.
男性生殖系统中产生精子和分泌雄性激素的分别是睾丸和附睾。
D.
胎儿通过脐带和胎盘从母体获得所需要的养料和氧气。
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【简答题】（ 2006 年石家庄市）某同学想用电流表、电压表测量一段电阻丝 R 的电阻，他已连接了部分电路，如图 20 甲所示。请你接着完成下列步骤： (1) 用笔画线代替导线，将电路补画完整． (2) 当电压表示数为 2.4V 时，电流表的示数如图所示，这时电路中的电流是 A ，电阻丝的电阻为 Ω ．这位同学通过改变被测电阻两端的电压，共测得三组对应的电压值和电流值，最后算出电阻的平均值，这样做的目的是 ...
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