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For example, 2 1 is a 180° (twofold) rotation followed by a translation of 1 / 2 of the lattice vector. 3 1 is a 120° (threefold) rotation followed by a translation of 1 / 3 of the lattice vector. The possible screw axes are: 2 1, 3 1, 3 2, 4 1, 4 2, 4 3, 6 1, 6 2, 6 3, 6 4, and 6 5.
The Apollo 12 Lunar Module landed near Surveyor 3 on November 19, 1969. Astronauts Conrad and Bean examined the spacecraft, and they brought back about 22 pounds (10 kg) of parts of the Surveyor to the Earth, including its TV camera, which is now on permanent display in the National Air and Space Museum in Washington, D.C.
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Mowag Piranha IIIH [12] Switzerland: Armoured personnel carrier Armoured reconnaissance vehicle: 80 [13] [14] * 45 armoured personnel carriers armed with 12.7mm machine gun & co-ax 7.62mm machine gun * 8 command vehicles armed with 12.7mm machine gun & co-ax 7.62mm machine gun * 2 ambulances * 1 recovery vehicle
The harmonic minor scale (or Aeolian ♮7 scale) is a musical scale derived from the natural minor scale, with the minor seventh degree raised by one semitone to a major seventh, [2] [3] [4] creating an augmented second between the sixth and seventh degrees.
1,2,3-Cyclohexatriene is an unstable chemical compound with the molecular formula C 6 H 6. [1] It is an unusual isomer of benzene in which the three double bonds are cumulated . This highly strained compound was first prepared in 1990, by reacting a cyclohexadiene derivative with cesium fluoride . [ 2 ]
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The polyiodides are a class of polyhalogen anions composed entirely of iodine atoms. [1] [2] The most common member is the triiodide ion, I −3.Other known larger polyiodides include [I 4] 2−, [I 5] −, [I 6] 2−, [I 7] −, [I 8] 2−, [I 9] −, [I 10] 2−, [I 10] 4−, [I 11] 3−, [I 12] 2−, [I 13] 3−, [I 14] 4-, [I 16] 2−, [I 22] 4−, [I 26] 3−, [I 26] 4−, [I 28] 4− and ...