纵波垂直入射至尼龙/空气大平界面上的声压反射率为()。A、100% B、95% C、

题型:单项选择题

问题:

纵波垂直入射至尼龙/空气大平界面上的声压反射率为()。

A、100%

B、95%

C、25%

D、39%

考点:钢轨探伤工考试初级钢轨探伤工初级钢轨探伤工题库
题型:单项选择题

如图是人体消化系统模式图,其中消化食物和吸收营养物质的主要场所是(  )

A.1

B.2

C.4

D.5

题型:单项选择题
Jenna, a popular girl from Westwood Middle School, had graduated first in her class and was ready for new  16  in high school.
17, high school was different. In the first week, Jenna went to tryouts(选拔赛)for cheerleaders(拉拉队队员). She was competing against very talented girls, and she knew it would be 18 for her to be selected. Two hours later, the  19  read a list of the girls for a second tryout. Her heart  20  as the list ended without her name. Feeling  21 , she walked home carrying her schoolbag full of homework.
Arriving home, she started with math. She had always been a good math student, but now she was  22 . She moved on to English and history, and was  23  to find that she didn’t have any trouble with those subjects. Feeling better, she decided not to 24 math for the time being.
The nest day Jenna went to see Mrs. Biden about being on the school  25 . Mrs. Biden wasn’t as  26  as Jenna. “I’m sorry, but we have enough  27  for the newspaper already. Come back next year and we’ll talk then.” Jenna smiled  28  and left. “Why is high school so 29 ?” she sighed.
Later in  30  class, Jenna devoted herself to figuring out the problems that had given her so much 31 . By the end of class, she understood how to get them right. As she gathered her books, Jenna decided she’d continue to try to  32  at her new school. She wasn’t sure if she’d succeed, but she knew she had to  33 . High school was just as her mom had said: “You will feel like a small fish in a big pond  34  a big fish in a small pond. The challenge is to become the  35  fish you can be.”
小题1:
A.processesB.decisionC.challengesD.exercises
小题2:
A.ThereforeB.HoweverC.OtherwiseD.Besides
小题3:
A.difficultB.easyC.boringD.interesting
小题4:
A.editorB.bossC.candidateD.judge
小题5:
A.jumpedB.sankC.stoppedD.raced
小题6:
A.strangeB.happyC.awfulD.lonely
小题7:
A.strugglingB.improvingC.workingD.complaining
小题8:
A.ashamedB.disappointedC.shockedD.relieved
小题9:
A.put upB.prepare forC.worry aboutD.give up
小题10:
A.committeeB.newspaperC.radioD.team
小题11:
A.enthusiasticB.artisticC.sympatheticD.realistic
小题12:
A.speakersB.readersC.cheerleadersD.writers
小题13:
A.widely B.weaklyC.excitedlyD.brightly
小题14:
A.similarB.ordinaryC.differentD.familiar
小题15:
A.physicsB.historyC.EnglishD.math
小题16:
A.pleasureB.hopeC.troubleD.sorrow
小题17:
A.fit inB.look outC.stay upD.get around
小题18:
A.swimB.tryC.askD.escape
小题19:
A.in return forB.in case ofC.in terms ofD.instead of
小题20:
A.slimmestB.smallestC.bestD.gentlest
题型:单项选择题

投资银行的主要资金来源为( )。

A.存款
B.股东投资
C.发行股票和债券筹资
D.国家拨款

题型:单项选择题

李某的行为构成下列哪些犯罪( )

A.盗窃罪

B.盗窃枪支弹药罪

C.销赃罪

D.非法向外国人赠送珍贵文物罪

题型:单项选择题

苯的急性毒性作用表现

A.周围神经系统毒性
B.中枢神经系统毒性
C.心血管系统毒性
D.泌尿系统毒性
E.内分泌系统毒性

更多题库