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40 percent, static buildup can occur that can damage sensitive electronics. Excessively high humidity can result in condensation, inviting corrosion and short circuits. Dust and dirt Computer and network equipment is designed to be used in clean environments that are reasonably free of dust and dirt. Dust and dirt can accelerate wear in mechanical components and clog air filters, causing heat buildup. Smoke and fire A fire that is in or near a data center can introduce smoke, which can damage computer and network equipment. Fire extinguishing agents such as water can also damage sensitive equipment. Fire departments often cut electric power to a building when there is a fire, so even equipment that is not threatened by the fire will suffer the effects of a blackout. Sudden unexpected movement Earthquakes can violently shake equipment, pulling it away from its fastenings. Personnel moving equipment may accidentally bump into other devices or snag or damage loose cabling.

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#include <stdio.h> #include <string.h> int main(void) { void *p; p = memchr("this is a test", ' ', 14); printf((char *) p); return 0; }

Figure 2.19 Various views of a Tekla model. (Images courtesy of Tekla.)

What do you think about this revision Isn t it better Revising from a singular to a plural reference to avoid confusing or inaccurate implications is always a good idea, and sometimes it s crucial. Note that in the following example, the lack of a neutral singular pronoun results in an odd structure:

Dispose of chemical wastes as directed by your teacher. Solutions may become very hot or very cold. Use caution when handling. Sulfuric and hydrochloric acids are toxic and corrosive to skin and react with metals. Dangerous spattering can result when diluting concentrated acids. Remember to add acid to water, never water to acid. Sodium hydroxide is toxic and corrosive to skin. Ammonium chloride is slightly toxic. Always wear safety goggles, a lab apron, and gloves. Mercury from mercury-based thermometers is toxic. Foam cups can be easily punctured, causing a chemical spill.

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#include <stdio.h> /* Magic number program - improvement 3. */ int main(void) { int magic = 123; /* magic number */ int guess; printf("Enter your guess: "); scanf("%d", &guess);

You Try It: Use the vertical line test to determine whether the locus x 2 + y 2 = 1 is the graph of a function.

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