凝点测定试验中对于黏度大的试样，脱水处理是将试样预热到（）50℃，经食盐层过滤。
A.不高于
B.高于
C.等于
参考答案：A
患者男性，65岁，有慢性阻塞性肺病史20年，近1周咳嗽加重，痰多，黏稠脓痰，3d来常胡言乱语，狂躁不安，1d前开始昏睡。血气分析：pH7.28，PaCO285mmHg， PaO248mmHg。应诊断
A．I型呼吸衰竭B．Ⅱ型呼吸衰竭C．急性脑炎D．躁狂症E．脑出血
An analyst does research about required rate of return. With respect to an investor's required rate of return, those components included in the nominal riskfree rate of return will most likely:
A. affect all of the investments.B. be relatively constant over time.C. affect the yield spread between government securities and corporate securities.
