为胞内寄生菌的肠道杆菌是（）
A.变形杆菌
B.肺炎杆菌
C.伤寒沙门菌
D.大肠埃希菌
E.志贺痢疾杆菌
参考答案：C
_____ by the belief that a key university is beneficial to one's future, many parents urge their children
to work hard. [ ]
A. Guide
B. Guiding
C. Guided
D. Having guided
恒力支吊架的吊杆在冷、热态条件下与垂线之间夹角不应超过（）°，必要时可进行偏装。
A、2
B、4
C、6
