What do the traditional gender roles refer to in the fourth paragraph
A. Women's getting into the paid labor force.
B. Women's stay at home to take care of home and children.
C. Multiple roles a woman plays in soxiety.
D. Social status assigned to a traditional woman.
正确的质子酸HPO2-4的离解反应是( )。
A. ( HPO2-4+H2O＝H2PO-4+OH-
B. ( H2PO-4+H2O＝HPO2-4+H3O+
C. ( HPO2-4+H2O＝PO3-4+H3O+
D. ( HPO2-4+OH-＝PO3-4+H2O
硝酸酯类防治心绞痛药的作用机制是
A. 松弛平滑肌
B. 扩张冠状动脉
C. 降低心肌耗氧量
D. 改善左心室顺应性
E. 保护缺血心肌细胞
施工合同示范文本规定，当合同文件发生矛盾时，应按顺序进行解释。下列顺序正确的是( )。
A. ( 合同协议书、通用条款、专用条款
B. ( 中标通知书、专用条款、协议书
C. ( 中标通知书、专用条款、投标书
D. ( 中标通知书、专用条款、标准
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