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.

相关考题

Which of the following is NOT trueA．Crude oil is found ...

单项选择题Which of the following is NOT true

A．Crude oil is found below land and water.
B．Crude oil is always found a few hundred feet below the surface.
C．Pumping and pressure force crude oil to the surface.
D．A variety of petroleum products is obtained from crude oil.

What is implied by the authorA．Shifiwork had a direct e...

单项选择题What is implied by the author

A．Shifiwork had a direct effect on the attitudes and behavior of family members.
B．Shifiworkers could live a normal life.
C．Shifiwork couples had unconventional ideas about marriage.
D．Female shifiworkers were satisfied with the time spent together with their families.

In order to continue the marriages of the shifiworkers,...

单项选择题In order to continue the marriages of the shifiworkers,______.

A．wives must learn to care for the children when their husbands are absent
B．shifiwork couples must administer their time and activities
C．wives mustn't adapt their own feelings of boredom to their husbands' work
D．all of these