The relationship between the major axis of the light-emitting body and the crystal axis of the crystal is called the optical orientation. The optical orientation varies depending on the crystal system to which the crystal belongs. The optical orientation of the intermediate crystal: the monoaxial crystal is a spheroid whose axis of rotation (optical axis) is consistent with the higher-order symmetry axis of the crystal [Fig. 2-8-8]. Light of the lower crystal Sexual orientation: The biaxial crystal light body is a triaxial ellipsoid with three mutually perpendicular quadratic symmetry axes (spindle), three symmetry planes (spindle surface) and one symmetry center. The symmetry element is equivalent to orthorhombic The symmetry element of the system [3L23PC]. Therefore, the optical orientation of the orthorhombic system is such that the three principal axes of the illuminating body coincide with the three crystal axes of the crystal. Which one of the major axes corresponds to which crystal axis, depending on the mineral Different (Fig. 2-8-9a). The symmetrical element of the monoclinic crystal is that the L2PC.y crystal axis is the quadratic axis of symmetry, the y axis coincides with one of the three major axes of the light body, and the other two principal axes and the crystal axis Oblique. Which one of the main axes is consistent with the y-axis, and how much the other two main axes are oblique to the crystal axis, depending on the type of mineral (Fig. 2-8-9b). The symmetry of the triclinic system is the lowest, only one symmetry The center is equivalent to the symmetrical center of the light body. Therefore, the optical orientation of the triclinic crystal is the three main elements of the light body. 
Classic Strength Equipment is a style we sell, which is a classic of Lifefitness. Including some pin-load bodybuilding equipment, fitness bench, dumbbell rack, barbell rack, as well as Gym Equipment such as cable crossover machine and Smith strength training machine.
The strength equipment in the gym is designed to exercise specific muscle groups, such as the back, deltoid, biceps, chest, etc. Using specific gym fitness equipment can achieve better exercise results.
What equipment do you need to build muscle?
For most home gyms, we recommend any collection of dumbbells and adjustable dumbbells paired with a bench. We also recommend weight plates and barbells with a bench or rack. This is because (as previously mentioned), free weights force your stabilizing muscles to be engaged in your muscle building workouts.
What gym equipment is best for muscle mass?
Rack, bench, and barbell: a powerhouse combination that unlocks unparalleled strength-building potential. Barbell exercises are great for building muscle mass throughout your entire body, as they engage multiple muscle groups simultaneously.
Can I build muscle using only a machine?
Exercise machines can be an efficient way for fitness beginners to build strength and muscle. Machines may be safer and easier to use because they require less technique than other weights. The leg press machine, lat pulldown, rower, and cable machines can lead to full-body gains, trainers say.
If you are not familiar with gym equipment and machines, you may be more familiar with free weight equipment such as barbells, dumbbells, and kettlebells. Free weight training is praised for its versatility and high quality anytime, anywhere, which can make training more flexible in busy lives and busy gyms, but this does not necessarily mean that they are more effective than fitness equipment.
Compared to barbells and dumbbells, weightlifting equipment can more accurately isolate muscle groups.
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