中毒型细菌性痢疾早期诊断主要靠()
A.临床症状
B.粪便培养
C.血清抗体测定
D.补体结合试验
E.特殊体征
参考答案:B
Mr. Smith __________ is smoking is looking for________ she lost yesterday. [ ]
A. whom; which
B. who; what
C. that; who
D. which; where
物质发生化学变化一定()。
A.有颜色变化
B.有发光发热现象
C.有新物质生成
D.有气体产生