题目内容
（请给出正确答案）
[主观题]
Which of the following is TRUE？A．The various petroleum products are produced by filtration
Which of the following is TRUE？
A．The various petroleum products are produced by filtration.
B．Heating and condensation produce the various products.
C．Chemical separation is used to produce the various products.
D．Mechanical means such as the centrifuge (离心机) are used to product the various products.
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