H1B DS160求助？

1. VISA NUMBER 是指签证右下角那个红色的号码，还是右上角那个CONTROL NUMBER阿？

Control number

2. Do you have any special skills or training such as firearms, ....
biological or chemical experience?
这个一般来说应该选NO吧，可是我是生物化学专业的， 也选NO么？
很多人为了避免麻烦，就写No。如果选择Yes，会让你做简单的解释。我就选择Yes，然后原因写成
My major is developmental biology.

3。 primary occupation, 请问生化专业是选natural science 还是选medical/
health 阿，我现在在医学院病理系做科研
严格说应该是NS。但你选择MH也可以啊。

4， 另外学历里的 course of study 是什么意思啊？

学科

对不起，我搞错了。VISA number 应该是右下角红色数字

看下面移民局的权威介绍
The visa number can be found on the Visa sticker on your passport page. The number can be 8 or more characters long, and in RED color, located towards the bottom right hand quarter of the Visa sticker. Be advised that the "Control Number" is not the Visa number.

If you mean a non-immigrant visa such as a B1, B2, F1, H1B, then it's on the visa itself. The visa would be the nice-looking laminated sticker (the new ones, at least) on your passport, and the number would be a long number on the top of the visa. If you lost it, there's going to be some minor problems obtaining the number, but you would have to contac the Dept. of State or the consular section where you obtained the visa. If you're talking about an immigrant visa, an A-number may or may not be assigned to you if you're still waiting for the petition to be approved. Generally, this would not be termed a "visa number". Check out any I-797 Notice of Action mailed by USCIS. The 9 digit number (sometimes 8 digits since the first number is assumed to be 0) would be above the beneficiary name (A *** *** ***). If the number's not there, then there's none assigned. Depending on why you need the "visa number", you can use the receipt number as proof that there's a pending petition (the receipt number is 13 characters long and starts with three letters like EAC, WAC, or MSC). For Non-Immigrant Visa, Visa number is the RED Number on the Visa itself. This answer is from USCIS.

不客气。祝好运