双燃料发动机润滑系统中有空气会产生滑油压力()。
参考答案:波动
"He has had one of his kidneys (肾)removed and has been ill, too," she ______in her diary.
A.put
B.noted
C.noticed
D.picked
增殖型肠结核X线征象中哪项不确切()
A.多发于回盲部
B.肠管狭窄,变形明显
C.多出现"跳跃"征
D.可合并不全性肠梗阻
E.盲肠短缩