判断心脏骤停最可靠的是()
A.注射利多卡因
B.静脉注射10%葡萄糖酸钙
C.同步直流电复律
D.非同步直流电复律
E.心音消失
参考答案:E
I ________ asleep because it took me a long time to realize that the telephone was ringing.
A.could fall
B.need have fallen
C.must have fallen
D.may fall
请演示肺部的直接叩诊。