For corrosion, possible causes may be ____.
a. liquid frozen in capillary tube
b. mechanical abuse; severe vibration; shock
c. overheating; overvoltage; voltage surges
d. excess moisture; salt air; acid fumes
d. excess moisture; salt air; acid fumes
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Which of the following materials is a pozzolana?
A) Portland cement B) Sand C) Fly ash D) Concrete E) Lime
The future of resource management should not be in computer modeling
Indicate whether the statement is true or false
Based on the Cu?Zn phase diagram shown in Fig. 11.23, and reproduced below, give the microstructure of three copper?zinc alloys containing (i) 30 at. %, (ii) 35 at. %, and (iii) 50 at. % Zn at:
(a) 800°C (b) 500°C (c) 25°C Assuming that the alloys were solidified by equilibrium cooling, give the phases and constituents.
The lifetimes, in months, of two components in a system, denoted X and Y, have joint probability density function
a. What is the probability that both components last longer than one month?
b. Find the marginal probability density functions 
and 
.
c. Are X and Y independent? Explain.