齿轮泵拆装时应检查轴封,必要时更换填料、调整压盖间隙或修理()。
A.机械密封
B.联轴器
C.轴承
D.齿轮
参考答案:A
上述疾病鉴别诊断主要根据是
A.感觉障碍的分布B.有无病理反射C.肌无力的程度D.有无尿潴留E.有无发热
An American call has a strike price of $60 and expires in 1.5 years. The current price of the underlying is $58.5 and the risk-free rate is 3.5%. The minimum value of this call is:()
A. $0
B. $0.53
C. $1.52