In some conventional fire alarm systems using a positive alarm sequence, alarm delay is usually adjustable for a period of up to _____.
a. three minutes
b. four minutes
c. five minutes
d. six minutes
a. three minutes
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Ascarid eggs are very resistant and can survive for years in the soil.
Answer the following statement true (T) or false (F)
________: the change in output or total product the business would achieve in the current period by expanding the use of an input by another unit.
Fill in the blank(s) with the appropriate word(s).
Answer the following statements true (T) or false (F)
1. The term prestressed concrete refers to both pretensioned and posttensioned concrete. 2. Reshoring concrete structures are necessary where excessive deflection of floor slabs or foundation settlement is anticipated on removal of shores. 3. The primary purpose of steel reinforcement is to increase the tensile strength of concrete elements. However, steel reinforcement is also used to increase the shear strength and compressive strength of concrete elements. 4. A construction joint in a concrete slab-on-ground is required if the concrete in the slab cannot be placed in one continuous operation. 5. A PT concrete slab-on-ground may either be a ribbed slab or a constant-thickness slab.
The roots of most plants cannot reach very far into the soil
Indicate whether the statement is true or false.