按照排序过程涉及的存储设备的不同，排序可分为______和______。
参考答案：内部排序；外部排序
What would have happened＿＿＿＿, as far as the river bank?
A．if Bob has walked farther
B．if Bob should walk farther
C．had Bob walked farther
D．if Bob walked farther
下列不属于胸外心脏按压并发症的是（）
A.肋骨骨折
B.气胸
C.胃内容物反流和误吸
D.心包积血
E.肺气肿
