Portland and similar cements react with water (hydrate) to create a gel that hardens by absorbing ____.
A. nitrogen dioxide
B. carbon dioxide
C. carbon monoxide
D. hydrogen monoxide
Answer: B
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In acid soils, ____________________ is needed to raise the pH value for efficient production of crops
Fill in the blank(s) with the appropriate word(s).Technician A says that most pressure regulating valves work by balancing hydraulic pressure against a spring force. Technician B says that electronic transmissions use solenoids to further regulate hydraulic pressure. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
The function of impedance is to assist the signal as it travels down a medium
Indicate whether the statement is true or false
What type of certificate authenticates the identity of the user?
a. Digital. b. Biometric. c. Encryption. d. E-mail signing.