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Why must all valves be open when an evacuation is

Why must all valves be open when an evacuation is performed?
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2. asked by Tony
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Two gas tanks containing compounds A and B are connected by separate valves to two ends of a 10 meter glass tube as shown below.
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Read "Evacuation."What was the name of the plan to relocate children to the English countryside during the war? Cornwall
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The heart has one way valves which open and close with each heartbeat. (1 point)A) one B) two C) three D) four
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The heart has ___one way valves which open and close with each heartbeat.O one O two O three O four
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The heart has____one way valves which open and close with each heartbeat.1 point) O one O two O three O four
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The heart has four one-way valves, which open and close with each heartbeat.(1 point)ResponsesTrueTrueFalse
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The heart has ____one way valves which open and close with each heartbeat.(1 point) Responses one one two two three three four
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The heart has four one way valves, which open and close with each hearfbeat(1 point) O Trie O False
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The heart has ____one way valves which open and close with each heartbeat. (1 point) Responses one one two two three three four
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