在利用红丹油鉴别法检验柴油机气门密封性能时,将涂上红丹油的气门压在气门座的工作锥面上,应旋转气门()圈,然后提起气门进行检查。
A.1/2
B.1/4
C.1
D.2
参考答案:B
T形管引流的作用是()
A.防止胆汁性腹膜炎
B.减轻胆总管缝合张力
C.促进炎症消退
D.防止胆总管狭窄、梗阻
E.促进Oddi括约肌水肿消退
When it comes to the Italian league, there's now an agreement _____ it has fallen behind its English match.
A.that
B.why
C.which
D.how