（），郑州粮食批发市场开业并引入期货交易机制，成为新中国期货交易的实质性开端。

Distortion of the spray pattern of a nozzle or injector may be indicated by a/an________.

A.high firing pressure

B.overload of that particular cylinder

C.smoky exhaust

D.cooling water temperature rise

A.rhyme scheme

B.rhythmic pattern

C.themes

D.length

By saying "My dog could tell the difference between bottled and tap water" (Lines 3-4, Paragraph 2), von Wiesenberger wants to convey the message that ______.

A．plain tap water is certainly unfit for drinking

B．bottled water is clearly superior to tap water

C．bottled water often appeals more to dogs' taste

D．dogs can usually detect a fine difference in taste

What is the text talking about？

A．What the difference are between water and other drinks.

B．What is human body made of.

C．Water is the best drink.

By saying “My dog could tell the difference between bottled and tap water” (Line 4 Para. 2), von Wiesenberger wants to convey the message that ________.

A) plain tap water is certainly unfit for drinking

B) bottled water is clearly superior to tap water

C) bottled water often appeals more to dogs taste

D) dogs can usually detect a fine difference in taste

A、water spray system

B、tire-stop water spray system

C、local exhaust ventilation system

D、tire water spray system

A.condenser

B.flashing device

C.lashing device

D.vacuum pump

A distorted spray pattern from a fuel injector can cause a diesel engine to have _____.

A.higher firing pressure

B.more power output

C.lower fuel pressure

D.less power output