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水泵装置总扬程 H＝Hst＋∑h 在实际工程中用于两方面：一是将水由吸水井提升到水塔所需的Hst 称为（） ；二是消耗在克服管路中∑h 称为：水头损失。
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排序题 （每题10分，共50分）Heimlick Maneuver(海姆立克急救法)Young children often swallow small objects, which may become lodged in their throat or windpipe. If the child becomes silent and isn’t able to breathe, begin the Heimlick Maneuver immediately.Step 1Call 911 or ask someone else to call 911.Step 2Squat behind the child as he stands in front of you. Place one hand on top of the pelvis line, in the middle of the abdomen. ___1___Step 3If that doesn’t work, place the child face down across your lap. Put one fist below the point where the ribs meet the breastbone. ___2___Step 4Straddle your child’s thighs or sit at his side. ___3___Step 5Attempt to open the airway by tilting his head and lifting his chin. ___4___ if there is no breathing, exhale forcefully into his mouth and watch to see if his chest rises with your breath.Step 6Open the child’s mouth and look inside to see if you have dislodged the object. If you see the object, sweep it out with a hooked finger.Step 7___5___ If normal breathing has not returned, continue the thrusts.
重()是中华民族的优秀传统。
()是一个民族赖以生存和发展的精神支柱。
中国传统文化将“()”置于“三不朽”之首。
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