设X→Y是一个函数依赖，且对于任何X'∈X，X'→Y都不成立，则称X→Y是—个
A. 完全函数依赖
B. 部分函数依赖
C. 平凡函数依赖
D. 非平凡函数依赖
What does the writer mean by saying "angels carry no harps. Angels carry hammers" Which of following is NOT true
A. This draws God closer to the workers and encourages them.
B. This is to inspire the young Teresita that she should believe in the workers and depend on them.
C. This is a challenge to the orthodoxy ideas that true religion belongs to the upper class.
D. This is saying that God is hardworking and does not indulge in playing.
霍乱病人在临床症状消失后可呈病后带菌，病后带菌可分为恢复期带菌和慢性带菌。恢复期带菌，排菌时间在多长时间内
A. 1周内
B. 15天内
C. 2个月内
D. 1个月内
E. 3个月内
发生猪囊尾蚴病(囊虫病)是因为
A. 食入被猪带绦虫卵污染的食物和水
B. 绦虫病人肠道中孕节和虫卵随逆蠕动返回胃
C. 吃了食猪囊尾蚴的猪肉
D. 绦虫病人吞食自己排出虫卵
E. A+B+C
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