《煤矿安全规程》规定，在井口附近或塌陷区内外的地表水体可能溃入井下时，必须采取措施，

做匀速圆周运动的两物体甲和乙，它们的向心加速度分别为a₁和a₂，且a₁＞a₂，下列判断正确的是：（     ）

A．甲的线速度比乙的线速度大

B．甲的角速度比乙的角速度小

C．甲的轨道半径比乙的轨道半径小

D．甲的速度方向比乙的速度方向变化得快

初产妇，孕39周，宫口开全2小时，频频用力，未见胎头拨露。检查：宫底部为臀，腹部前方可触及胎儿小部分，未触及胎头。肛查胎头已达坐骨棘下2cm，矢状缝与骨盆前后径一致，大囟门在前方，诊断为

A．头盆不称

B．原发性宫缩无力

C．骨盆入口轻度狭窄

D．持续性枕后位

E．持续性枕横位

Read this article and find out which one is a must-read for your children for Thanksgiving.

Clifford’s Thanksgiving Visit

Clifford has to stay home with his neighbors, as Emily Elizabeth’s family goes visiting her grandmother. At first, Clifford feels lonely, thinking of his own family, but then he decides to visit his mother too. He travels many miles, crosses bridges, and he even gets into the subway!   Follow Clifford’s trip to the big city! At http://www.powells.com. it is $3.99. The author is Norman Bridwell. It is for children aged 4-8.

The Magic Tree House

The Magic Tree House describes how Jack and Annie return back to the eve of the first Thanksgiving. There they meet the pilgrims(移民) as well as Squanto, a native American who helped them. The story offers an age-appropriate, in-depth picture of what life was really like for early settlers, as well as their adventures and excitements. It is for ages 4-8. The book costs

$2.50 at http://www.powells.com. The author is Sal Murdocca.

Franklin’s Thanksgiving

Franklin thinks that there will be an over-abundance of food for Thanksgiving dinner. So he invites his teacher and friends for Thanksgiving dinner. It costs $2.50 at www.Powells.com. The book is for children aged 4-8. The author is Paulette Bourgeois.

The First Thanksgiving

The First Thanksgiving is for ages 4-8 and it tells about the story of the pilgrims’ learning languages. It is beautifully illustrated with plenty of beautiful watercolors(水彩画). The author is James Waiting and the price of the book is $2.50. You can find it on http://www.powells.com.

小题1:Clifford travels to the big city probably because ________.

A．he is eager to visit his grandmother

B．he is not happy at home

C．he misses his neighbors very much

D．he likes traveling very much小题2:If you are interested in the pilgrims’ life you can read ________.

A．Clifford’s Thanksgiving Visit

B．The Magic Tree House

C．Franklin’s Thanksgiving

D．The First Thanksgiving小题3:Kids can understand The First Thanksgiving better with the help of ________.

A．teachers

B．other readers

C．pictures

D．computers

男性，52岁患者，因咳嗽、胸闷、气短1周收入院。查体：左锁骨上可触及一个花生米大小的淋巴结，质硬、固定、无压痛，气管向左侧移位，右肺叩诊呈浊音、语颤明显减弱、呼吸音肖失。胸液常规示蛋白含量35g/L，WBC 850×10⁶／L，N 20％，L 80％，细胞学见大量淋巴细胞。LDH 800U/L，PPD(+)。最可能的诊断是

A．右侧大叶性肺炎

B．右侧结核性胸膜炎

C．右侧恶性胸腔积液

D．右侧化脓性胸腔积液

E．右侧漏出性胸腔积液

什么是凝析井气，有哪些特点？