Which material is used for vapor retarder under a concrete slab-on-ground?
What will be an ideal response?
A plastic (typically polyethylene) sheet.
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Answer the following statement(s) true (T) or false (F)
1. An implied datum is an assumed plane, axis, or point from which a dimensional measurement is made. 2. When dimensioning the location of a feature of size on a part, implied datums should be used. 3. A datum is the origin for dimensional measurements. 4. The datum feature symbol should be specified to be read from the top of a drawing. 5. Where a datum feature symbol or a datum reference frame symbol is repeated on a drawing, it is not necessary to designate them as reference.
Which of the following traits would benefit cattle in the wild?
a. docile nature c. small horns b. slow speed d. thick hide
Geologists estimate the time since the most recent cooling of a mineral by counting the number of uranium fission tracks on the surface of the mineral. A certain mineral specimen is of such an age that there should be an average of 6 tracks per 
of surface area. Assume the number of tracks in an area follows a Poisson distribution. Let X represent the number of tracks counted in 1 of surface area. Find
a. P(X = 7)
b. P(X ? 3)
c. P(2
e. 
What is a low water cut out?
A) it is an operating control that shuts off the boiler at the end of every operating cycle when it senses that the boiler has used up its supply of water B) it is a safety device that shuts off the boiler if the water level is low C) it is an operating control that energizes the water fill solenoid at the end of an automatic blow-down cycle D) it is a hand valve installed near the bottom of the boiler that is used for filling and servicing the boiler