诊断颅内占位病变,目前最有价值的无损伤性检查方法是
A.脑电图
B.颅脑超声波
C.同位素扫描
D.头颅X线摄片
E.CT或MRI
参考答案:E
Peter ________ a little money every month so that he can buy a car of his own in the near future.
A.setsaside
B.setsabout
C.setsoff
D.setsout
()由立式电动机和立式离心泵直接组装在一起,全部潜入水中工作的泵。
A、潜水泵
B、离心泵
C、其它
D、泥浆泵