孕妇缺钙最常见的是引起()。
A.腓肠肌痉挛
B.腰骶部疼痛
C.下肢浮肿
D.尿频
E.皮肤弹力纤维断裂
参考答案:A
解析:[知识点] 妊娠中、晚期仰卧位低血压综合征的症状
John ran up to him and helped him to stand up.______ up to him, John helped him to stand up.
影响城市发展的区域条件有多少条
A.5
B.6
C.8
D.10