問題詳情

點擊查看答案

內容推薦

• 17．如图，一简谐横波在x轴上传播，轴上a、b两点相距12m。t ＝0时a点为波峰，b点为波谷；t ＝0.5s时，a点为波谷，b点为波峰。则下列判断中正确的是 (A)波一定沿x轴正方向传播 (B)波长
• 18．两种单色光由水中射向空气时发生全反射的临界角分别为 、 ，已知 > ，用nn2分别表示水对两单色光的折射率，vv2分别表示两单色光在水中的传播速度，则 （ ）
• If you’re buying today’s paper from the stand, could you get for me?(A)one (B) such (C)this (D)
• . (A)Falling (B) Lying (C)Appearing (D)Thinking
• (A)like (B) as (C)except (D)among
• 读图1，结合所学知识回答1～2题。 正确反映我国城市化水平变化曲线是 (A)甲 (B)乙 (C)丙 (D)丁
• The Well Hotel stands in a quiet place the main road at the far end of the lake.(A)to (B) for (C
• . (A)bent (B) hit (C) shook (D)pulled
• When Glen Kruger picked a small cat from an animal shelter, he did not expect much. Yet right from t
• 21．最近，科学家在望远镜中看到太陽系外某一恒星有一行星，并测得它围绕该恒星运行一周所用的时间为1200年，它与该恒星的距离为地球到太陽距离的100倍。假定该行星绕恒星运行的轨道和地球绕太陽运行的轨道

內容推薦

• 19．一定质量的气体经历一缓慢的绝热膨胀过程。设气体分子间的势能可忽略，则在此过程中（ ） (A)外界对气体做功，气体分子的平均动能增加 (B)外界对气体做功，气体分子的平均动能减少 (C)气体对外界
• 18．如图所示，四个完全相同的弹簧都处于水平位置，它们的右端受到大小皆为F的拉力作用，而左端的情况各不相同：①中弹簧的左端固定在墙上，②中弹簧的左端受大小也为F的拉力作用，③中弹簧的左端拴一小物块，物
• (A)animals (B) friends (C)farmers (D)neghbors
• (A)and (B) but (C) or (D)so
• Leave your key with your neighbor you lock yourself out one day.(A)as long as (B) even though (C
• We used to see each other , but I haven’t head from him since last year.(A)especially (B) regula
• . (A)sharing (B) visiting (C) dividing (D)discovering
• (A)Thus (B) Otherwise (C) Then (D)Rather
• I feel so excited! At this time tomorrow morning I to Shanghai.(A)will be flying (B) will fly(C)
• 1 戶籍行政之主管機關，在中央為下列何者？(A)經濟部(B)交通部(C)法務部(D)內政部
• 14．现有1200个氢原子被激发到量子数为4的能级上，若这些受激氢原子最后都回到基态，则在此过程中发出的光子总数是多少？假定处在量子数为n的激发态的氢原子跃迁到各较低能级的原子数都是处在该激发态能级上
• — I’m terribly sorry to interrupt, but may I use your phone? It’s rather urgent.— Yes, .(A)with
• . (A)anything (B) nothing (C) something (D)everything
• . (A)walked (B) ran (C)returned (D)withdrew
• Not until he retired from teaching three years ago having a holiday abroad.(A)he had considered
• One of our rules is that every student wear school uniform while at school.(A)might (B) could (C
• . (A)familiar (B) lovely (C)ordinary (D)outstanding
• . (A)rapidly (B) ruddenly (C)madly (D)urgently
• Jack is a great talker. It’s high time that he something instead of just talking.(A)will do (B)
• . (A)shut out (B) shut off (C) shut down (D)shut up
• . (A)bedroom (B) basement (C)yard (D)house
• The newcomer went to the library the other day and scarched for he could find about Mark Twain.(
• . (A)marched (B) flew (C)struggled (D)climbed
• (A)at the bottom of (B) in the middle of (C). at the top of (D) in the front of
• (A)regretting (B) resting (C)relaxing (D)recovering