Occupational health and safety laws _______
A) Have been enacted across all of Europe B) Are very similar in the U.S. and Canada
C) Are intended to protect employees D) All of the above
D
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Refer to Exercise 31. Assume the first card is not replaced before the second card is drawn.
a. Find the joint probability mass function of X and Y.
b. Find the marginal probability mass functions 
(x) and 
(y).
c. Find 
and 
.
d. Find 
.
e. Find Cov(X, Y).
Some types of FCA welding electrodes need ____ electrode preheating.
A. very high B. no C. very low D. more
A(n) ____________________ is created when current passes through a conductor and establishes a magnetic field.
Fill in the blank(s) with the appropriate word(s).
A properly shaped and sized ________ will melt both root faces and ensure adequate root fusion
A) keyhole B) Root face C) Fill pass D) none of the above