冬天北方下雪时,常用融雪剂清理路面,醋酸钾(CH3COOK)是效果较好的融雪剂,

题型:选择题

问题:

冬天北方下雪时,常用融雪剂清理路面,醋酸钾(CH3COOK)是效果较好的融雪剂,下列关于1mol CH3COOK的叙述正确的是(  )

A.摩尔是国际单位制中七个基本物理量之一

B.CH3COOK的摩尔质量为98g

C.1mol CH3COOK含有2mol氧

D.1mol CH3COOK含有3×6.02×1023个H

考点:化学单位(摩尔)阿伏加德罗常数
题型:选择题

条件同第91题,若每户设置饮用净水水嘴2个,则入户饮用净水支管设计秒流量为( )。

A.0.04L/s
B.0.06L/s
C.0.08L/s
D.0.10L/s

题型:选择题

阅读下面短文,掌握其大意,然后从所给的A、B、C、D四个选项中,选出最佳选项。
At the 1924 Olympic Games in Paris, the favorite team in the four-man canoe race was the United States team. One member of that team was a young man by the name of Bill Havens.
As the time for the Olympics   36  it became clear that Bill’s wife would give birth to their first child about the time that the U.S. team would be   37  in the Paris games. In 1924 there were no jet airliners from Paris to the United States, only   38  ocean-going ships. And so Bill found himself in a   39 . Should he go to Paris and   40  not being at his wife’s side when their baby was born? Or should he   41  from the team and remain with his family?
Bill’s wife   42  that he go to Paris.   43 , competing in the Olympics was his life long   44 . But Bill felt   45 and, after much   46  searching decided to withdraw from the competition and remain home, where he could   47 his wife when the child arrived.
As it   48 , the United States four-man canoe team won the gold medal in Paris. And Bill’s wife was   49  in giving birth to their child. She was so late,   50 , that Bill could have competed in the event and returned home in time to be with her when she gave birth.
People said, “What a shame.” But Bill said he had no   51 . For the rest of his life, he believed he had made the   52  decision. Bill Havens knew what was most   53  to him. Not everybody figures that out. And he acted on what he believed was best.   54  everybody has the strength of character to say no to something he or she truly wants in order to say yes to something that truly   55 . But for Bill, it was the only way to peace; the only way to no regrets.
小题1:
A.nearedB.startedC.ended D.narrowed
小题2:
A.practisingB.competingC.entering D.trying
小题3:.
A.expensiveB.heavyC.large D.slow
小题4:
A.hurryB.puzzleC.dilemmaD.trouble
小题5:
A.avoidB.riskC.bearD.missed
小题6:
A.breakB.keepC.wanderD.withdraw
小题7:
A.complainedB.preferredC.insistedD.promised
小题8:.
A.After allB.Above allC.In allD.At all
小题9:.
A.purposeB.struggleC.opportunityD.dream
小题10:
A.disappointedB.conflictedC.confused D.encouraged
小题11:
A.memoryB.decisionC.soul D.peace
小题12:.
A.supportB.watchC.comfort D.raise
小题13:
A.fed backB.pointed outC.came outD.turned out
小题14:
A.effortlessB.sorryC.late D.hard
小题15:.
A.at lastB.in factC.without doubtD.in brief
小题16:
A.painsB.sufferingsC.defeatsD.regrets
小题17:
A.betterB.biggerC.worseD.more
小题18:.
A.obviousB.trueC.importantD.close
小题19:
A.AlmostB.CertainlyC.SurelyD.Not
小题20:.
A.1astsB.mattersC.worksD.rewards
题型:选择题

一个完全竞争厂商在短期均衡时可能是()。

A.AVC下降

B.AC下降

C.MC下降

D.一可变要素的平均产量上升

题型:选择题

房颤患者控制心室率在()

A.静息时60~80次/分,活动后<100次/分

B.静息时60~100次/分,活动后<120次/分

C.无论任何情况下都应是<120次/分

D.静息时50~70次/分,活动后80次/分左右

E.无论任何情况下都应是<100次/分

题型:选择题

腹部膨大,肢体瘦弱,发稀,额上青筋显现,多为()

A.五迟

B.泄泻

C.疳积

D.积滞

E.厌食

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