Which of the following are components of a mechanical seal? （） (1) stationary ring (2) rotational ring (3) packing (4)spring<br>A:(1), (2) and (3)<br>B:(1), (2) and (4)<br>C:(2), (3) and (4)<br>D:None of the above

Which of the following are components of a mechanical seal? （） (1) stationary ring (2) rotational ring (3) packing (4)spring
A:(1), (2) and (3)
B:(1), (2) and (4)
C:(2), (3) and (4)
D:None of the above

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