您要查找的是不是：
- photoelectric threshold contrast 光电阈衬比
- photoelectric threshold wave length 光电阈波长
- The cabin has a flat stone for a threshold. 这间小屋用一条扁平的石头做门槛。
- The treaty will be the threshold of lasting peace. 这个条约将成为持久和平的开端。
- He was on the threshold of his career. 他的事业刚刚起步。
- He had never crossed the threshold of a bar before. 他过去从未进过酒吧的门。
- photoelectric threshold 光电阈
- Scientists are now on the threshold of an important discovery. 科学家们很快就会有一项重大发现。
- Photoelectric work offers the widest scope. 光电工作提供了最广阔的天地。
- The photoelectric cell controls a servomotor. 该光电管控制着一个伺服电动机。
- The tax threshold for a single pensioner is 450 dollars. 单身养老金领取者的征税起点是450美元。
- The court is not legally justified in stopping at the threshold of the case. 一开始就使案件停止不前，法院这样做是完全不合法的。
- Sanli Photoelectric Technology Development Co. 三立光电技术开发公司。
- They are at the threshold of a new career. 他们正要开始干一番新的事业。
- The intensifier tubes use the photoelectric effect. 无源像增强管使用光电效应。
- There must be a threshold of thermal noise. 必有一个热噪声的门限值。
- He is on the threshold of success. 他即将成功。
- He was at the threshold of his career. 他的事业才开始。
- A photoelectric instrument for ascertaining cloud heights. 云高计测算云高的一种光电设备
- There is a hamlet on the threshold of a cajon. 狭谷口有个小村庄。
