饲养密度及各种病原体(病毒、细菌、寄生虫等)属于影响实验动物的环境因素中的()。
A.物理因素
B.化学因素
C.生物因素
D.人为因素
参考答案:C
阅读理解
Here's Tom's invitation(请柬)
It's My Birthday
I hope you can come to my party
Time: 7:30 in the evening
Date: January l0th
Place: My House(No. 34 Zhongshan Road)
Tel(H).0713-4331155
1. Tom will have _______ party.
A. a birthday
B. an English
C. a family
D. a morning
2. Tom's birthday is on ________.
A. January ten
B. February 10th
C. January tenth
D. February 12th
3. The party starts ________ .
A. at 7:30 in the evening
B. at 7:00 in the evening
C. at 8:00 in the morning
D. at 8:30 in the morning
4. Tom will have his party ________ .
A. in Room 34
B. in his classroom
C. in his house
D. at school
患者男性,50岁。进食时有哽噎感,咽下食物时胸骨后有烧灼样疼痛,近来症状有加重。初步判断为食管癌。
拟对该患者施行食管切除胃代食管术。术前可进行的肠道准备包括().
A.术前1周遵医嘱给予患者分次口服抗生素溶液
B.术前1日禁食
C.术前3日改流质饮食
D.术前1日晚遵医嘱予以生理盐水100ml加抗生素经鼻胃管冲洗食管及胃
E.手术日晨常规置胃管
F.术前晚行清洁灌肠