2025年1月31日 · Hepatitis B is a vaccine-preventable liver infection caused by HBV. HBV is transmitted when blood, semen, or another body fluid from a person infected with the virus …

B：Black，数字越大，越软，越黑; H：Hard，数字越大，越硬，越浅; HB：Hard与Black，适中; F： Fine point; 注意：这个标准是相对的，各个厂商有自己的内部标准。不同厂家的同型号铅笔 …

三菱鉛筆則和日本工業規格（JIS）的規格有所不同，集合了10H至10B，總共22個種類。 2B>3B>4B後 數字越大 顏色越深，但相對筆芯較軟. 您需要登陸來添加評論。 依照日本工業 …

2024年10月4日 · Hepatitis B is a serious liver infection caused by the hepatitis B virus (HBV). For most people, hepatitis B is short term, also called acute. Acute hepatitis B lasts less than six …

HB GRAPHITE SCALE. The second graphite grading scale is known as the HB scale. Most pencil manufacturers outside of the U.S. use this scale, using the letter “H” to indicate a hard pencil. …

2025年2月8日 · Hepatitis B is a viral infection that damages your liver. You can get it if you’re exposed to infected bodily fluids. The acute form of the virus often goes away without …

Hepatitis B is an infection of the liver caused by the hepatitis B virus. The infection can be acute (short and severe) or chronic (long term). Hepatitis B can cause a chronic infection and puts …

2025年1月31日 · The United States Food and Drug Administration (FDA) has licensed three single-antigen vaccines (Engerix-B, Heplisav-B, and Recombivax HB), and three combination …

Learn the basics of hepatitis B, including symptoms, spread, prevention, vaccination, and treatment. Learn about hepatitis B testing, who should be tested, and how testing can protect …

石墨铅芯的硬度标志，一般用“h”表示硬质铅笔，“b”表示软质铅笔，“hb”表示软硬适中的铅笔，“f”表示硬度在hb和h之间的铅笔。 石墨铅笔 共分 6B、5B、4B、3B、 2B、B、HB、F、H、2H …