《建设工程监理规范》规定，项目总监理工程师应由具有( )年以上同类工程监理工作经验

读图，关于甲地高度的说法正确的是

A、甲相对于乙的高度是110米

B、甲相对于乙的高度是40米

C、甲的海拔高度是40米

D、甲的海拔高度是150米

某同学看到学校中的一个水管在滴水，马上前去拧紧．在此过程中他突然想到水滴下落的快慢有什么规律吗？于是他和几名同学找来秒表、刻度尺、数码相机等器材开始了研究．首先他们调整水管阀门使水能一滴滴的下落，并保持水管向下滴水的时间间隔相等．此时他们将刻度尺放在水滴下落路径的旁边，用数码相机拍照．分析照片之后发现，每滴水的运动规律基本相同．其中一幅照片如图1所示．水滴从图中最上面一滴水位置至最下面一滴水位置的运动过程中，下列说法中正确的是（　　）

A．水滴下落的过程中速度逐渐增大

B．水滴在前一半时间内的平均速度较全程的平均速度小

C．水滴在前一半时间内的平均速度较全程的平均速度大

D．水滴下落过程中平均速度随着下落高度的增大而增大

小明由生活中水滴下落现象联想到实验室里做过的“”测小车的平均速度“的实验中，小车从带刻度的斜面顶端由静止下滑，如图2所示的圆圈是小车到达A、B、C三处时电子表的显示（数字分别表示“小时：分：秒”）

（1）该实验测小车平均速度的实验原理是：______．

（2）实验中使用的斜面的坡度______，（填“较大”或“较小”）其目的是：______．

（3）若s₂的路程正好是全部路程的一半，小车通过下半段路程的平均速度V_AB=______m/s．

滚动轴箱组装不良，轴承内圈、楔套和（）三者之间发生相对运动时，楔套内、外表面会发生擦伤，应及时进行更换。

A、轴肩

B、轴颈

C、防尘环座

D、轮座

创业咨询师的道德挑战？

As the pace of life continues to increase, we are fast losing the art of relaxation. (1) you are in the habit of rushing through life, being on the go from morning till night, it is hard to (2) down. But relaxation is (3) for a healthy mind and body.Stress is a (4) part of everyday life and there is no way to (5) it. In fact,it is not the bad thing that it is often supposed to be. A (6) amount of stress is important to provide motivation and give (7) to life. It is only when the stress gets out of control (8) it can lead to poor performance and (9) health.The amount of stress a person can bear(10) very much on the individual. Some people are not afraid of stress, and such (11) are obviously chief material for managerial responsibilities. Others lose heart at first (12) of unusual difficulties. When exposed to stress, in (13) form, we react both chemically and physically. In fact we (14) a choice between escape and fight. But in more ancient days they made the (15) between life and death. The crises (危机)we meet today are (16) to be so extreme,but however little the stress,it requires the same response. It is when such a reaction (17) long，through continued exposure to stress，that health becomes (18) ．Such serious conditions as high blood pressure and heart diseases have (19) links with stress． (20) we canno! remove stress from our lives we need to find ways to deal with it．It would be unwise to do so even it we could．So what do you think of stressWhat is your way to deal with it.

第（8）空应选择（）

A．when

B．why

C．that

D．how