![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[单选题]
下列哪个值是凝血酶原时间(PT)危急值的上限?()
A.上限:≥40s
B.上限:≥30s
C.上限:≥20s
D.上限:≥60s
查看答案
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.上限:≥40s
B.上限:≥30s
C.上限:≥20s
D.上限:≥60s
凝血酶原时间(PT),超过正常对照多少为异常 ()
A.>正常对照8s
B.>正常对照3s
C.>正常对照5s ()
D.正常对照2s
E.>正常对照10s
A.在指数平滑法中,预测成功的关键是的选择
B.值愈大,新数据所占的比重就愈大,原预测值所占比重就愈小,反之亦然
C.在实际应用中,值是根据时间序列的变化特性来选取的
D.一般情况下哪个值引起的预测误差小,就采用哪个
A.<1.5mmol/L;>5.5mmol/L
B.<2.0mmol/L;>6.5mmol/L
C.<2.5mmol/L;>5.5mmol/L
D.<2.5mmol/L;>6.5mmol/L