切菜机、搅拌机、绞肉机、和面机均属于（）设备。
A.通用机械
B.初加工机械
C.加热工机械
D.精加工机械
参考答案：B
患者女性，22岁，突发心悸，心电图显示为房室折返性心动过速
心脏发生折返的部位（）。
A.只有心房可发生折返
B.只有心室可发生折返
C.只有心房、心室可发生折返
D.只有房室结可发生折返
E.心脏各个部位均可发生折返
He will have learned English for eight years by the time he ______ from the university next year.[ ]
A. will graduate
B. will have graduated
C. graduates
D. is to graduate
