In what ways is rock wool used in crop production?
What will be an ideal response?
It is formed into propagation cubes for seed germination and cutting
propagation. It is used in slabs for production of fresh flowers and vegetable
produce. It is produced in a granular form for incorporating into potting substrate.
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This picture shows what type of pump?
A) Gear pump
B) Vane pump
C) Gerotor pump
D) None of these
Para una halada en ángulo o en U, la longitud de la caja de derivaciones que aloja conductores protegidos a tensiones superiores a 600V debe ser de _____ veces el diámetro exterior del conductor protegido más grande que entra en la caja.
a. 24 b. 36 c. 48 d. 60
Which of the following statements is true?
A rigid vessel with known volume initially contains 10 moles of A and 10 moles of B at 298.15 K, and nothing else. The reaction A+B?C+D occurs in the liquid phase, but not in the vapor phase. When the vessel reaches equilibrium, at 298.15 K, both a liquid and a vapor phase are present. The equilibrium constant for the reaction is 0.4. The vapor pressures are 0.12 MPa for compound A, 80kPa for compound B, 0.15 MPa for compound C and 70kPa for compound D. You are trying to calculate the eight unknown values of number of moles (N), one for each compound in each phase that will be present at equilibrium.
Which of the following statements regarding mechanical-draft cooling towers is correct?
A) Crossflow cooling towers may be used for indoor applications. B) Three fans are required for a forced-draft crossflow cooling tower. C) Counterflow towers are shorter and wider than crossflow towers. D) Only one fan is required for an induced draft counterflow tower.