Which of the following statements is true for efflorescence?
A. It is a deposit of acids on the surface of a masonry wall.
B. It can be prevented by using calcium chloride to accelerate the mortar setting time.
C. It appears as a white stain on brick walls.
D. It only occurs on walls that do not contain moisture or soluble salts.
Answer: C
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a. to the side b. above c. below d. on the ground
What kind of symbol is shown in Figure 4?
a. Basic surface texture symbol b. Material removal prohibited c. Material removal by machining is required d. Material removal by any method desired e. None of the above
________________ testing determines whether the pump is producing its specified output.
Fill in the blank(s) with the appropriate word(s).
A level of C02 up to _______ ppm is considered safe for humans for an 8 hour period
Fill in the blank(s) with correct word