左心室长轴切面上可显示的结构有()
A.右心室
B.室间隔
C.左心室
D.二尖瓣
E.肺动脉瓣
参考答案:A, B, C, D
To their great relief, the missing child returned home,________, after an absence of two weeks. [ ]
A. felt tired and sound
B. tiring and soundly
C. feeling tired but soundly
D. tired but sound
简述租船合同中的许可装、卸时间的规定方法。