用水冲洗管道。 A: Flush the pipes with water. B: Rinse the pipes with water. C: Clean pipes with running water.

What factors can increase the force onthe walls of the pipes in any piping systems A: Narrower pipes B: Thicker pipes C: The properties of fluid D: Extra fluid

freight car(s) / passenger car(s)A A _______________ seals a brake pipe.B Brake pipes are connected by a _________________.

The old people often raise______for the sake of companionship. A: pets B: pipes C: pills D: pies

What are the factors that increase the pressure on the tube wall？ A: The properties of the fluid B: Vasodilatation of vessel C: Narrower pipes. D: Extra fluid

The water used to cool the city’s buildings travels in a closed ________ inside 48-inch pipes that run for 15 miles beneath the

The city was even equipped with a _______ system, for a great many clay pipes were found beneath the narrow streets. </p></p>

Emulsion oils and sodium nitrite are both approved additives， but the latter cannot be used if any pipes are （） or if any soldered joints exit.

The sound of the pipes ________ images of misty Highland glens and men in kilts. ( ) A: emerges B: reminds C: conjures up D: demonstrates

When water pipes made with cast iron are frozen in winter, they will be expanded and cracked due to the expansion of ice, but the ice in the tube will not be destroyed, this is because _____.