Is it illegal for employers to restrict gender when recruiting?

Workers are not discriminated against because of nationality, race, sex and religious belief. Women enjoy equal employment rights with men. State organs, social organizations, enterprises and institutions shall implement relevant state regulations to ensure that women engage in scientific, technological, literary, artistic and other cultural activities and enjoy equal rights with men. When hiring employees, except for jobs or posts that are not suitable for women as stipulated by the state, women shall not be refused employment or the employment standards for women shall be raised on the grounds of gender. All units shall sign labor (employment) contracts or service agreements with female employees in accordance with the law, and the labor (employment) contracts or service agreements shall not stipulate the contents that restrict the marriage and childbirth of female employees. Equal pay for equal work for men and women. Women enjoy equal rights with men in enjoying welfare benefits.