压力容器焊接属于安全技术防范系统施工过程常见危险源
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Wedesiretoestablish_____beneficialbusinessrelations.
Icanstillrememberthesittingroom____Iusedtositintheevening.
Ioftenthoughtofmychildhood,____Ilivedonafarm.
Thetwomainprintmediais:（）
Hebuiltatelescope____hecouldstudytheskiesinhisfreetime.
