夏秋季最易发生的食物中毒是
A.有毒植物性食物中毒
B.细菌性食物中毒
C.有毒动物性食物中毒
D.真菌毒素食物中毒
E.化学性食物中毒
参考答案:B
The “three-point estimates” method for estimating activity duration differs from the “single point, most-likely estimate” method in that it uses ______ .
A.an average of the three estimated durations to estimate activity duration
B.“dummy” activities to represent logic ties
C.“free float” instead of “total float” in the schedule calculations
D.bar charts instead of logic diagrams to portray the schedule
情感性障碍()
A.临床症状变化大,以情绪和行为异常为主
B.病程较长,有循环发作趋势
C.病程短暂,与突发创伤性事件关系密切
D.持续警觉,回避
E.常见丰富的幻觉,尤其幻视,意识障碍波动