起重机打滑的原因是因为主动轮与轨道的粘着力()。
A、太小
B、太大
C、不变
参考答案:A
Flu is a very ______ infectious disease. Fever, headaches, coughing and fatigue are some of its ______ symptoms.
A.normal; common
B.usual; ordinary
C.common; usual
D.ordinary; normal
中医学关于“证候”的概念是
A.对疾病症状的认识B.阴阳失调的外在表现C.对疾病体征的辨证认识D.对疾病某一阶段的病理概括E.体征与症状的综合表现