纵隔气肿X线摄影体位除常规体位外,还必须加照
A.前弓位
B.侧位
C.侧卧水平正位
D.仰卧前后位
E.切线位
参考答案:B
解析:纵隔气肿X线摄影体位除常规体位外应加照胸部侧位。
______of time and energy has been spent in making theearthquake-stricken areas a permanent
museum to remindpeople how disastrous a natural disaster can be. [ ]
A. Iarge quantities
B. A great deal
C. A great many
D. A plenty
导致发动机无油压或油压低的原因是()
A.机油已经失效
B.机油泵失效
C.油的粘度较低
D.发动机自身燃烧状况不好