真值
参考答案：“真”和“假”称为命题的逻辑值，简称真值。
— ______ he ______ at this school last term?
— I think so. [ ]
A. Did, study
B. Has, studied
C. Was, study
D. Did, studied
男婴，1岁，突发腹痛、呕吐、便血，并可触及腹部包块，应首先考虑
A．粘连性肠梗阻B．肠套叠C．肠扭转D．幽门梗阻E．肠系膜血栓形成
