用吊线或水平仪可测量垂直管法兰螺栓孔是否正。 ( )
参考答案：对
On hearing of the case some time later, Conan Doyle was convinced that the man was not guilty, and immediately went to work to ascertain the truth.
A. explore B. obtain C. verify D. search
慢性萎缩性胃炎B型的病变主要在（）
A.胃底
B.胃角
C.胃体
D.胃窦
E.幽门
