由y=|x|和y=3所围成的封闭图形，绕x轴旋转一周，则所得旋转体的表面积为__

小题1:.My brother a__________ a knowledge of computers by careful study. 

小题2:.Can you tell me a________ of time if you’re coming?

小题3:.I a_________ of your trying to earn some money, but please don’t neglect your studies.

小题4:.They a_________ the value of the house at over $250,000.

小题5:.I’m d__________ to hear of your success.

小题6:.When you find someone hurt, you should perform first a___as soon as possible.

小题7:. Why do you value money so much? Is it e__________ to happiness?

小题8:.The d_________ air in the room will make food go bad easily.

小题9:. He has gone to the hospital for special t___________ because of his high fever.

小题10:..Remember to cover the burned area with a dry and clean b_________.

佛教的主要经典有( )。

A．《律藏》

B．《丹珠尔》

C．《经藏》

D．《圣训》

如图所示，水平粗糙的轨道与半径为r、竖直光滑的半圆形轨道在水平相切处连接，有一质量为m的小滑块（可视为质点）在水平轨道的C点以初速度v₀沿直线CB进入圆轨道，并从轨道的最高点A水平射出，已知CB长为L。射出后，滑块恰好落在距B点为2r的E点（E点在B，C的连线上），如果滑块与水平轨道间的动摩擦因数为μ，D点是半圆弧形轨道上的一点且与圆心在同一水平线上，不计空气阻力，则

A．滑块滑到最高点A处时，对轨道的压力大小为mg

B．滑块进入半圆轨道的B点时，对轨道的压力大小为6mg

C．滑块滑到D点处时，对轨道的压力为零

D．滑块在C点时的速度v₀的大小为

对该患者诊断考虑为 * * 断裂，但无尿外渗，若试行留置导尿失败，应作哪项处理

A．耻骨上膀胱造瘘
B．耻骨上膀胱穿刺造瘘
C．以金属导尿管导尿
D．会阴血肿清除+ * * 断端吻合
E． * * 会师

Little Tom was very nervous in front of so many strangers, so he ____ and ran to his mother. [ ]

A. turned out

B. turned off

C. turned down

D. turned around