柴油机活塞、缸套及活塞环磨损时出现（）。
A.上排气
B.下排气
C.正常排气
D.上下排气
参考答案：B
What a pity! When we got to the cinema,the movie The Assembly ,so we saw only the end of it. [ ]
A. had just finished
B. was finishing
C. would finish
D. just finished
关于新版银行承兑汇票，下列属于变造票特征的是（）
A.票号处的数字有更改痕迹
B.紫外光下纤维丝有红蓝双色荧光反应
C.紫外光下主题图案有绿色荧光反应
D.紫外光下票号处有网格状团花
