食品腐败变质的坚定指标包括()
A.感官指标
B.放射性指标
C.物理指标
D.化学指标
E.微生物指标
参考答案:A, C, D, E
He has got himself into a dangerous situation _____ he is likely to lose control over the plan. [ ]
A. where
B. which
C. that
D. why
用于病毒分离的标本应该在病程的哪期采集()。
A.潜伏期
B.急性期
C.恢复期
D.迟缓期
E.不应期