采用高压蒸汽灭菌时，一般选用
A、121℃20minA
暂无解析
Thestudentsarerequiredto________themainideasofthearticleintheirownwords.
ModernEnglishvocabularydevelopsthroughthefollowingchannelsEXCEPT______.
In1900,theUnitedStatesrankedfirstintheworldintheproductionof________.
Weareinterestedintheweatherbecauseit_______ussodirectly—whatwewear,whatwedoandevenhowwefeel.
Australia,whichisoneoftheworld'sdevelopedcountries,hasbecomerichthrough________.
