司法鉴定人本人或者其（）与（）、委托的鉴定事项或者鉴定事项涉及的案件有利害关系，可能

如图所示，一长为L的薄壁玻璃管放置在水平面上，在玻璃管的a端放置一个直径比玻璃管直径略小的小球，小球带电荷量为-q、质量为m。玻璃管右边的空间存在方向竖直向上、磁感应强度为B的匀强磁场。磁场的左边界与玻璃管平行，右边界足够远。玻璃管带着小球以水平速度v₀垂直于左边界向右运动，由于水平外力的作用，玻璃管进入磁场后速度保持不变，经一段时间后小球从玻璃管b端滑出并能在水平面内自由运动，最后从左边界飞离磁场。设运动过程中小球的电荷量保持不变，不计一切阻力。求：

（1）小球从玻璃管b端滑出时速度的大小；

（2）从玻璃管进入磁场至小球从b端滑出的过程中，外力F随时间t变化的关系；

（3）小球飞离磁场时速度的方向。

According to traditional Cherokee beliefs, we are part of (1) . We don’t (2) with it and we’re not trying to (3) it. We are a part of the Great Life. And within the Great Life, there are three great Laws of Nature, which tell us how we have to live in (4) with everything else. The First Law of Nature is that you don’t take any life without real (5) . So we shouldn’t (6) needlessly. We believe everything is alive, including animals, plants and (7) . And so to us, taking the life of a plant is just as grave a 8() as taking the life of an animal. The Second Law is that everything we do should (9) the Great Life. And everything we do (10) the Great Life, and everything that (11) within the Great Life affects us. So it’s very important that what we do will not (12) other parts of the Great Life. The Third Law basically is that we don’t (13) where we live. And where we live is not our (14) , small community. It’s this (15) . We don’t pour chemical (16) down the drain because they all wind up in the water. It might seem a little difficult to live by those three laws in this (17) society. But there are still a lot of things that we can do to bring these laws into our lives, such as (18) , using the (19) as little as possible, and (20) gardening.

从电视中我们有时看见太空空间站里的宇航员“漂浮”在空间站的舱体中，下列说法中正确的是 [ ]

A.宇航员受到了空气巨大的浮力

B.宇航员不受重力作用

C.宇航员质量大大减小了

D.宇航员处于失重状态

若在某工程施工过程中发生以下事件：5月1日～5月15日因发包人原因而延误，5月5日～5月25日因客观原因而延误，5月13日～5月22日因承包人原因而延误。则在5月13日～5月15日时间段内承包人可以获得的补偿是( )。

A．工期补偿

B．费用补偿

C．工期+费用补偿

D．没有补偿

对于不同的建筑，空调冷负荷计算的修正系数取值不同，医院的修正系数值为( )。

A．0.8～1.0
B．1.2～1.6
C．1.6～2.4
D．2.8～3.5