About half of the ____________________ content of a mature plant may be found in the seed and fruit
a. Nitrogen c. Potassium
b. Phosphorous d. Fluorine
B
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En caso de pérdida de la energía, los sistemas de reserva obligatorios por ley deben tener la capacidad de suministrar energía de reserva dentro de un máximo de _____ segundos.
a. 10 b. 30 c. 60 d. 90
The earliest recorded timber shortage occurred in ____, about 5,000 years ago
A) China B) United States C) Europe D) Spain
A large amount of oxygen around flammable materials or sparks can cause _____
a. slow, persistent oxidation of the electrodes b. severe weakening of the root pass welds c. rust or scale to enter the weld puddle d. rapid and uncontrolled combustion
What are the advantages of water for use in a thermal storage system?
A) its temperature remains stable when charging and discharging B) water can store more heat per pound than ice or phase change materials C) universal availability and low cost D) water storage takes up less space than ice or phase change materials