无损磁性测厚仪是根据它的探头和（）之间的磁通量变化指示出防腐层厚度。
A.玻璃布
B.底漆
C.沥青
D.钢基
参考答案：D
______ the project completed, all the workers anxiously looked forward to _______what they should. [ ]
A. With; be paid
B. After; pay
C. After; being paid
D. With; being paid
女童，9岁，外阴部疼痛伴出血， * * 口上方暗红色肿块，从肿块中央能插入导尿管，最可能的诊断是
A． * * 肿瘤
B．膀胱葡萄状肉瘤
C． * * 肿瘤
D． * * 黏膜脱垂
E．输尿管囊肿
