** 1. Dab tsi yog qhov txawv ntawm A213 thiab A249? **
- ** ASTM A213 **: Qhia tawm * seamless * Ferritic thiab antenietic stainless leeg rau boilers, thiab kev hloov pauv kub hauv qhov kub kub.
- ** SHTM A249 **: Duav * Welded * Austenitic steel leeg (piv txwv li, tig-welded) rau kev hloov cua sov lossis cov hws khov. Qhov sib txawv tseem ceeb yog kev tsim khoom (Seamless vs. Welded) thiab thawj cov ntawv thov (High-Kub thiab siv hluav taws xob).
** 2. Dab tsi yog ASTM A269? **
- ** ASTM A269 **: Tus qauv rau * Relded Austenitic Stainless Hlau Tubing * Rau kev pab cuam corrosion-resistant thiab tsawg \/ kub-kub kev pab. Feem ntau siv nyob rau hauv kev lag luam xws li kev ua zaub mov noj, cov chaw muag tshuaj, thiab khoom siv tshuaj lom.
** 3. Dab tsi yog qhov txawv ntawm MF thiab UF capacitors? **
- ** MF (Millifarad) **: 1 mf=0. 001 Farad lossis 1, {5}} microfarads (μF).
- ** μF (microfarad) **: 1 μf=0. 000001 Farad.
* Ceeb Toom *: Hauv cov laus schematics, "MF" qee zaum siv tau rau μF, tab sis cov qauv niaj hnub siv "μF" rau cov me me rau Millifarads.
** 4. Dab tsi yog lub ntsiab lus ntawm Astm qib? **
- ** ASTM qib **: Kev faib tawm cov khoom siv cov khoom siv tshuaj lom neeg, cov khoom siv mechanies (piv txwv li cov qauv A240. Cov qib kawm kom haum rau cov ntawv thov tshwj xeeb (piv txwv li, corrosion tsis kam, lub zog).
** 5. Dab tsi yog "txhais tau tias nyob rau Astm cov qauv? **
- ** "M" ** QHIA * Metric units * (Si chav). Piv txwv li, ** A106m ** yog Metric version ntawm ASTM A106 (cov dej num roj carbon monoxide (mpa cia hauv cov nti thiab psi.
