Scanning Electron Microscope Sharpness Standard 掃描電子顯微鏡銳度標(biāo)準(zhǔn)
Silicon Nanoparticles (Nominal Diameter 2 nm) 硅納米顆粒(公稱(chēng)直徑2海里)
Bituminous Coal (Nominal Mass Fraction 5 %Sulfur) 煙煤(名義硫質(zhì)量分?jǐn)?shù)5%)
Bituminous Coal (Nominal Mass Fraction 3 % Sulfur) 煙煤(名義硫質(zhì)量分?jǐn)?shù)3%)
Subbituminous Coal (Nominal Mass Fraction 0.5 % Sulfur) 亞煙煤(名義硫質(zhì)量分?jǐn)?shù)0.5%)
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