Вопрос № 1077808 - Английский язык

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Pyroelectric infra-red sensors consist of a ceramic element, an alumina substrate and a circuit with field effect transistors (FET) and strong resistance, a window material.
To attain excellent sensitivity in a pyroelectric sensor, it is essential to make the pyroelectric element thin enough for a low-heat capacity. The engineers also must work out a specific sensor structure for little heat dissipation.
A pyroelectric infra-red sensor is using a conductive bonding agent to fix the pyroelectric element to the lead terminals of the stem. As a result, the clearance between the element and the alumina substrate holding the circuit remains constant, a construction that avoids heat dissipation. The element itself is between 50 and 100 µm thick, to offer appropriate heat capacity and handling ease.
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The engineers must work out a specific sensor structure for __________________.

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Valency is the reason for the varying weights of the same element in different compounds. Once you know the valency of all the elements you can work out for yourself the formula for a chemical compound, provided you know its molecular weight, for valency tells you the number of atoms of one element that must combine with one atom of the other, and their total weights must add up to the molecular weight.
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Valency is the reason for the varying weights of the same element _________________.

А _____ gives a view of the whole building from above.

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