Ordinary units and numbers need spaces, but there are also special ones, such as xbridge peptide beh c 18 OBD preparation column, 300? , 5 ? M, 19mm x 100mm, 1/pkg Note that bold characters do not need spaces, and some symbols are easily confused but do not need spaces, such as 20% and 37℃.

Extended data

Common English abbreviations:

1. American Accounting Association

2.AAL: American Airlines American Airlines

3. Association of British Chambers of Commerce.

4.ABS: US Bureau of Shipping.

5.AC: Air Canada Air Canada

6.ACC: American Chamber of Commerce (also known as Amcham).

American Economic Association American Economic Association

8.af: Air France

9. Authorize foreign exchange banks to designate foreign exchange banks.

10.afrasec: Asian-African Economic Cooperation Organization.

1 1. Annual General Meeting of Shareholders: Annual General Meeting of Shareholders.

12. Assistance: USAID.

13.ama: American Management Association American Management Association

American Standards Association American Standards Association

American Stock Exchange: American Stock Exchange