pbb怎么记

The content of PBB-PA/ Sb2O3 had little effect on the tensile strength of ABS compared with PBB/ Sb2O3. The addition of PBB-PA improved the impact property.

与PBB/Sb2O3相比，PBB-PA/Sb2O3的用量对ABS的拉伸强度影响较小，并且PBB-PA的加入能够改善ABS的冲击性能。

Objective To realize the changes of blood lead ( PbB) levels and blood cadmium ( CdB) levels and the status of exposure to lead and cadmium in provincial capitals and counties.

目的了解人体血铅血镉的变化和县镇人群铅镉暴露的状况。

Under strict quality control, the authors investigated the levels of PbB among 270 women from early pregnancy to delivery and their infants.

在严格的质量保证措施下，对北京石景山地区270名孕妇及其婴儿进行了血铅的追踪调查。