103.
A. The location of the equipment (where it is) is not what this sentence is about.
B. Correct because the function is then mentioned: to remove water from gas.
C. Composition means the structure of the equipment, or how it is put together or assembled, so it is wrong in this sentence.
D. specification is a technical property/characteristic of the equipment and the sentence is talking about the function of the equipment.
104.
A. other is incorrect as it doesn’t refer to an additional item.
B. the other one means there are only two items: this one and the other one.
C. another is correct as is indicates a different one taken from many items. The sentence could also have read: If the item is damaged, another one will be sent.
D. any other is incorrect as it implies that it can be any item when it fact it has to be the same as the first item which was damaged.