普通螺纹的牙形角是()度,英制螺纹的牙形角是55度。
A、50
B、55
C、60
D、65
参考答案:C
选出与画线部分意思相同或相近的选项。
1. Many old things are on display in the museum. [ ]
A. sold
B. on sale
C. on show
D. open
2. We failed to watch the final match. [ ]
A. caught
B. missed
C. kept
D. wanted to watch
3. I don't care about whatever you do. [ ]
A. no matter what
B. wherever
C. ever
D. no matter where
4. There is lots of rain in this area. [ ]
A. many
B. plenty of
C. a few
D. a number of
5. They're having a great time in Hong Kong. [ ]
A. having a good rest
B. enjoy themselves
C. enjoying themselves
D. having a good break
1940年指挥八路军进行百团大战的指挥员是 [ ]
A、彭德怀
B、叶挺
C、周恩来
D、陈毅