检修抽油泵时应检查泵工作筒的()。
A.同轴度
B.圆柱度
C.圆锥度
D.垂直度
参考答案:D
右肺上叶后段薄壁空洞,直径2cm,内有较小的液面,空洞周围肺内有渗出病变,右下叶及左肺中下野有多发斑片状渗出,选择可能较大的诊断()
A.肺结核病(干酷性肺炎)
B.肺脓肿
C.血源性肺脓肿
D.空洞型肺癌
E.肺真菌病
----I have tried very hard to find a solution to the problem, but in vain
----why not consult with Frank? You see, _________.
A.great minds think alike
B.two heads are better than one
C.a bird in the hand is worth two in the bush
D.it’s better to think twice before doing something