感染性心内膜炎均有心脏原发病变，其中以先天性心脏病最多见()
参考答案：错
—I hear you have to get up early every morning. —Right. It’s one of the _______ of my family.
A．plans
B．jobs
C．programs
D．rules
数字式仪表在测量方面有何特点？
