一辆汽车以速度v行驶了2/3的路程，接着以20 km/h的速度减速，后以36 k

[听力原文]11-15

Good evening. Welcome to the first meeting of our spring cycling season. It’s a pleasure to see so many new faces here. I certainly hope that most of you will soon feel right at home with our group.

The state of New Jercy offers enough opportunities for bicyclists of all abilities. Beginners will find the shore and area suitable for their needs while expert riders will meet a challenge to their skill and energy.

We organize tours to a variety of places nearly every weekend. Next Saturday’ s tour will be an easy one. Interested cyclists should meet at eight a.m. in the parking area. The minimum time for this tour is about six hours. You can pick up a map of Saturday’s tour at the information table before you leave this evening.

Where should the cyclists interested in next Saturday’s tour meet
They should meet in（）at 8 a. m.

用饱和的氯化铁溶液制取氢氧化铁胶体，正确的操作是

A．将饱和氯化铁溶液滴入蒸馏水中即可

B．将饱和氯化铁溶液滴入热水中，生成棕黄色液体即可

C．将饱和氯化铁溶液滴入沸水中，并继续煮沸至生成红褐色液体即可

D．将饱和氯化铁溶液滴入沸水中，并继续煮沸至生成红褐色沉淀即可

一艘浮在河面上的轮船，不装货物时，排开水的体积为200 m³，当它装上1800 t货物后，排开水的体积是______．（ρ_水=1.0×10³kg/m³）

关于腰椎前后位摄片的叙述，下列哪项是错误的()

A.常规位置

B.必须使用滤线器

C.常与侧位片一同摄取

D.X线管阴极端必须对上部腰椎

E.取深呼气后屏气曝光