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Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, and 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing code in the group NXX for various other purposes.
Calling an 800-number is free of charge. Calling a 400-number incurs a local access charge. 800-numbers are accessible only to land-line subscribers, while 400-numbers are accessible to all land-line and mobile users. 800-toll-free numbers. 800 toll-free numbers are commonly called "800 免费电话".
800: ×: 480 5∶3: 5∶3: 1∶1: 384,000: W-PAL Wide PAL: 848: ×: 480 53∶30 : 16∶9: 1.006 407,040: FWVGA: List of mobile phones with FWVGA display: 854: ×: 480 427∶240 : 16∶9: 0.999 409,920: SVGA: Super VGA Nintendo Wii, Nintendo 64 HiRes, GameCube HiRes 800: ×: 600 4∶3: 4∶3: 1∶1: 480,000: qHD: Quarter FHD: AACS ICT, HRHD ...
The 800 MHz frequency band is a portion of the electromagnetic spectrum, or frequency band, that encompasses 790–862 MHz. Being a part of the spectrum known as "UHF Bands IV and V" (i.e. 470 MHz to 862 MHz) it was allocated by the ITU to Broadcasting as the primary user in Region 1 and was used for analogue television broadcasting before ...
Log–log plot comparing the yield (in kilotonnes) and mass (in kilograms) of various nuclear weapons developed by the United States.. The explosive yield of a nuclear weapon is the amount of energy released such as blast, thermal, and nuclear radiation, when that particular nuclear weapon is detonated, usually expressed as a TNT equivalent (the standardized equivalent mass of trinitrotoluene ...
Hardness comparison table. Brinell HB. (10 mm Ball, 3000 kg load) Vickers HV. (5 kg) Rockwell C HRC. (120 degree cone 150 kg) Rockwell B HRB. (1/16" ball 100 kg)
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