有个兄弟，给我发了试译稿，我看了下，应该有改进的空间。但他认为我耍他，两句话不合，就把我qq拉黑了。我也不知道他水木id，这里附上他的稿子，以及我改的稿子，表示诚意吧。对不起这位兄弟，如果稿子改动很大的话，我也不好交差。这位兄弟算译得不错了，稍微注意点就好。其实我水平也有限，朋友让我复杂质量把关，我总得看一下吧。改得不一定合适，凑合看吧。
个人一孔之见，请勿见笑。
另外，我当时给他了500字，他也答应试译500字，但他最终只返回150字，让我通过这150字来判断他，似乎不太公平。希望能认真对待吧。

5  根据试件自振频率的大小，选择相应的频率测量范围。调整激振器和拾振器增益，以粗调迅速找到试件的共振点后，再细调。当微安表或示波管指示的振幅增至最大时即为共振，从数字计数器上读出频率，作为混凝土初始自振频率。重复测试两次，测试结果的波动范围应小于0.5%。 5. According to the natural vibration frequency of the test-piece, the corresponding frequency measurement range is selected. Firstly coarsely adjusting the gain of the vibration exciter and the vibration pick-up to quickly find the resonance point, then fine adjusting is carried out. Reading the frequency as the concrete initiative natural frequency of vibration from digital counter when the indicative amplitude on microampere or oscilloscope tube increases to the largest. Repeating the test twice and the fluctuation range of the test results should be less than 0.5%.
修改：According to the natural frequency of the specimen, select an appropriate frequency measurement scope. Roughly adjust gains of the vibration exciter and the vibration pick-up to quickly find the resonance frequency of the specimen, and then finely adjust them. When the amplitude indicated on the microammeter or the oscilloscope reaches a maximum value, it means occurrence of resonance. Read the frequency from the digital counter as the concrete initial natural frequency. Repeat the test twice. The oscillation shall be less than 0.5% for the test result.    
6  将试件装入试件盒中，注入拌和水，水面应超出试件顶面20mm。 Pack the test-piece into the box and inject into mixing water, and the water surface shall be 20mm above top surface the test-piece.
修改：Put the specimen into the box and immerse it with water for mixing; the water surface shall be 20 mm above the top surface of the specimen.

小的问题是：试件=specimen; microampere=微安培，不是微安表；还有个别单复数没把握准，如gain，后面说的是两个东西的增益，所以用gains。

大的问题是：试验操作类的句子，以祈使句为主，指明做啥，比方说，select an appropriate frequency measurement scope,这里不宜用被动句；而：Reading the frequency as the concrete initiative natural frequency of vibration from digital counter when the indicative amplitude on microampere or oscilloscope tube increases to the largest.，这个句子，when以前的句子，应该是主句，但没有找到动词，reading, 应为read; 后面还有一个Repeating the test twice and …， 这也是没有动词，应把ing去掉。这样，最后把and后面的被动句拆开，因为，两个不同类型的句子，用and连接，显然不合适。
Firstly coarsely adjusting the gain of the vibration exciter and the vibration pick-up to quickly find the resonance point, then fine adjusting is carried out. 这句，then 前面加一个连词比较好，then只是副词，没有连接句子的功能。
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修改:natie FROM 211.101.11.*
FROM 211.101.11.*