A:which
B:it's
C:whose
D:whom
注射用链霉素试验针的药液配制方法如下
(1)把1.0g链霉素溶于水制成4.0mL,得溶液①
(2)取0.1mL溶液①加水稀释至1.0ml,得溶液②
(3)取0.1mL溶液②加水稀释至1.0mL,得溶液③
(4)取0.2mL溶液③加水稀释至1.0mL,得溶液④
最终得到的试验针药液中,链霉毒的质量分数是(整个过程中药液很稀,密度近似看做1 g/mL)( )
Try to ________ half an hour each day for keeping a diary, and you'll achieve distinction in writing.
根据拼音填写汉字。
ɡòu ____当 shē____欠 shè____香 半shǎnɡ____
liè qiè____ dān____误 家juàn____ 害sào____