What is the speaker's problem?
A.He knows nothing about engineering.
B.He wants to postpone the presentation.
C.He never spoke to high school students before.
D.He is not yet ready for the presentation.
第4题
抗可溶性抗原的抗血清要长期保存,理想的方法是
A.液体4℃
B.低温
C.加叠氮钠
D.真空干燥
E.液氮罐保存
第5题
抗可溶性抗原的抗血清要长期保存,理想的方法是
A.4℃
B.低温
C.加叠氮钠
D.真空干燥
E.液氮罐保存
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