饲养试验

在投资建设项目的建设基本程序中，生产准备工作应贯穿在项目建设的______阶段。

A．决策

B．实施准备

C．实施

D．投产竣工

E．生产运营

根据研究，每种活动都存在最佳的动机水平，这种最佳动机水平随活动的性质不同而有所不同。随着任务难度的增加，最佳动机水平有（）的趋势。

A.逐渐下降

B.逐渐上升

C.迅速上升

D.稳定不变

New York is one of the most exciting cities in the world.

You might want to do some shopping in New York. Fifth Avenue is probably New York’s most famous shopping street, but if you go, be prepared to "window shop" only. This is shopping for the rich. There are other, less expensive shopping areas nearby, and you’ll soon find famous stores such as Bloomingdale’s, Macy’s and FAO Schwartz. And if you’ve brought your rollerblades(滑板), then a visit to Central Park is a must. This is a large, open park right in the middle of Manhattan, but if you thought that people came here to relax, then you’d be wrong. Nobody sits in Central Park: they run, jog(慢跑), and most of all they rollerblade.

When you leave New York, you might be tired, but the one thing you won’t be is bored!

Where is for the rich to go shopping

光固化复合树脂充填时，分层光照每层的厚度不超过（）.

A.0.5mm

B.1mm

C.1.5mm

D.2mm

E.2.5mm

变压站（所）内铝金属性的设备接头过热后其颜色会变为（）。

A.红色

B.黑色

C.灰白色