您要查找的是不是：
- This paper introduces research and development of DH pneumatic perforating machine, hydraulic percussion hammer and trajectory -controlled pneumatic perforating machine and their application. 非开挖技术在国际发展迅速，在我国尚有差距，本文介绍我国DH气动穿孔机、液压冲击锤、轨迹可控气动穿孔机的研制及工程应用情况。
- percussion hammer firing mechanism 击针锤击发装置
- Flint's percussion hammer 弗林特(氏)叩诊锤
- This layer of rock contains a lot of flint. 这一岩层中有大量燧石。
- Your cigarette-lighter needs a new flint. 你的打火机需换新电石了。
- At that time they have learn to strike fire from flint. 那时他们已学会了用燧石打火。
- They spend the winter(s) in a warmer climate. 他们在气候较暖的地方过冬。
- Most plural nouns in English end in "s". 英语的复数名词多以“s”结尾。
- The sweater had shrunk after repeated washing(s). 这件套头毛衣洗过多次已缩水了。
- Some old folk(s) have peculiar tastes. 有些老人有特殊的爱好。
- A piece of flint used as a tool by primitive human beings. 打火石原始人作为工具用的一块打火石
- Taylor's percussion hammer 泰勒(氏)叩诊锤
- At that time they had learned to strike fire from flint. 那时他们已学会了用燧石打火。
- Answer the following question(s). 回答下列问题。
- Most plural nouns in English end in s'. 英语的复数名词多以s结尾。
- percussion hammer 冲击式凿岩机,冲击锤,叩诊锤
- The drug affects one's power(s) of concentration. 这种药影响人精神不能集中。
- Here are the designs. Which one(s) do you prefer? 这就是那些图样.;你喜欢哪一个[些]?
- folding percussion hammer 折式打诊锤
- Which journal(s) do you subscribe to? 你订阅哪一种杂志?
