问题
单项选择题
牙型角为60º的螺纹是（）。
A.G1/2
B.Tr40x5
C.NPT1/2锥管螺纹
D.R1/2
答案
参考答案：C
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牙型角为60º的螺纹是（）。
A.G1/2
B.Tr40x5
C.NPT1/2锥管螺纹
D.R1/2
参考答案：C
| 用方框中所给单词的适当形式填空。 | |
2. The novel is so moving that it's well worth ________. 3. There is no doubt that the Huangyan Island ________ to China. 4. Our government is trying to make sure the students take school buses ________. 5. We hope Liu Xiang will run ________ than any other runner in the London Olympics. |