妊娠期需要有大量的_____在母体中,才能供给胎儿骨骼和牙齿生长发育之用。
A.钙
B.锌
C.铜
D.铁
正确答案是A
扫描二维码免费使用微信小程序搜题/刷题/查看解析。
版权声明:本文由翰林刷题小程序授权发布,如需转载请注明出处。
本文链接:https://doc.20230611.cn/post/145924.html
上一篇:Passage 1 Last year was a satisfactory year for MacGregor's with sales rising 15% compared to the previous twelve months. The profit before tax increased by 22% and the after-tax profit showed an increase of 31%. The disparity between the pre-tax
下一篇:为了提高对光纤信道的利用率,常采用的多路复用技术是( )