As the pressure ______, the accumulated snow is turned into ice crystal.（1991年考试真题）A．

The pressure ________ causes Americans选择

The high pressure in fuel injection system of the diesel engine is produced by the _____.A

_____ provides the head or pressure to supply the domestic water where required.A.The comp

According to the fifth rule, a pressure cooker cover should be opened______ .A．as soon as

In the _____ pressure charging system the pulse of energy that occur as the exhaust is rel

According to the passage, many languages die______.A．under the pressure from dominant lang