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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".
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 ...
10 x 800 kt / 8730 kg: Unknown 1986 Yes Silo 220 m 4 UR-100N UTTKh: USSR Khrunichev Machine-Building Plant: 10,000 km 105,600 kg 6 x 550 kt / 4350 kg Active: 1977: Yes: Silo 350-500m 5 RT-2PM Topol: USSR Votkinsk Machine Building Plant: 10,500 km 45,100 kg 800 kt Active 1985 No Road-mobile TEL: 200–900 m 6 RT-2PM2 Topol-M: Russia
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 ...
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)
Toll Free: These are usually ten digit numbers beginning with 800 or 400. 800 (toll-free) are accessible only when called from landline phones, while 400 (shared toll) are accessible from all phones. 400 XXX XXXX or 800 XXXX XXXX. Service numbers: These are usually 3- to 5-digit numbers (e.g. Police is 110) used to access an emergency service ...
The term display resolution is usually used to mean pixel dimensions, the maximum number of pixels in each dimension (e.g. 1920 × 1080 ), which does not tell anything about the pixel density of the display on which the image is actually formed: resolution properly refers to the pixel density, the number of pixels per unit distance or area, not ...
800 (eight hundred) is the natural number following 799 and preceding 801. It is the sum of four consecutive primes (193 + 197 + 199 + 211). It is a Harshad number, an Achilles number and the area of a square with diagonal 40.
A number is a mathematical object used to count, ... The earliest known use of irrational numbers was in the Indian Sulba Sutras composed between 800 and 500 BC.
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