单项选择题

How is crude oil brought to the surface

A．By expansion of the hydrocarbons.
B．By pressure and pumping.
C．By vacuum created in the drilling pipe.
D．By expansion and contraction of the earth's surface.

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单项选择题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 are used to produce the various products.

单项选择题Many thousands of hydrocarbon compounds are possible because______.

A．the petroleum products vary greatly in physical appearance
B．complicated refining processes rearrange the chemical structure
C．the two atoms in the molecule assume many positions
D．the pressure needed to force it to the surface causes molecular transformation