胆囊结石的诊断依据,不包括()
A.上腹部不适、隐痛、饱胀、嗳气
B.右上腹压痛、Murphy征阳性
C.胆绞痛病史
D.触及肿大的胆囊
E.B超检查
参考答案:A
硅酸盐水泥熟料中,以下()项矿物含量最高。
A.C3S
B.C2S
C.C3A
D.C4AF
以下哪个参数可以调整2A事件触发的难易度()
A.Absolute Threshold of the Quality ofthe Currently Used Frequency
B.Absolute Threshold of the Quality ofthe Non-used Frequency
C.Hysteresis
D.Weight of the Currently Used Frequency