问题 问答题 简答题

请说明使用油镜的操作步骤是什么?

答案

参考答案:

(1)在使用油镜之前需将油镜头和玻片用二甲苯或1:1乙醚纯洒精拭净,将高倍镜下已找到的结构移至视野中央,接着把镜头升高约1cm,将油镜头转至镜筒直下方,滴香柏油一滴于切片上欲观察之处,从侧面注视镜头、使之慢慢下降至镜头浸入油滴,但与玻片相距约0.5mm左右,然后用左腿从目镜观察,再用细调节器调至最清晰时为止。

(2)使用油镜时光线需更强,用完后必须用擦镜纸擦干净镜头和玻片的油迹,再用1:1乙醚纯洒精拭净。

单项选择题

As with any work of art, the merit of Chapman Kelley’s "Wildflower Works I" was in the eye of the beholder.

Kelley, who normally works with paint and canvas, considered the twin oval gardens planted in 1984 at Daley Bicentennial Park his most important piece.

The Chicago Park District considered it a patch of raggedy vegetation on public property that could be dug up and replanted at will like the flower boxes along Michigan Avenue. And that’s what happened in June 2004, when the district decided to create a more orderly vista for pedestrians crossing from Millennium Park via the new Frank Gehry footbridge.

If you’re looking for evidence that the rubes who run the Park District don’t know art when they see it, all you have to do is visit what’s left of Kelley’s masterpiece. The exuberant 1.5-acre tangle of leggy wildflowers is now confined to a tidy rectangle, restrained on all sides by a knee-high hedge and surrounded by a closely cropped lawn. White hydrangeas and pink shrub roses complete the look. We don’t know who’s responsible for the redesign, but we’ll bet the carpet in his home doesn’t go with the furniture.

Still, you’d think the Park District was within its rights to plow under the prairie. Wrong. Kelley just won at lawsuit in which he argued that the garden was public art and therefore protected by the federal Visual Artists Rights Act. Under that law, the district should have given him 90 days’notice that it intended to mess with his artwork instead of rushing headlong into the demolition, a la Meigs Field. That way Kelley could have mounted a legal challenge, or at least removed the plants.

Park District officials said they never considered the garden a work of art, even though it was installed by an established artist and not, say, Joe’s Sod and Landscaping. We can understand their confusion. Just recently, we figured out that the caged greenery directly south of Pritzker Pavilion is supposed to be an architectural statement and not a Christmas tree lot.

All that’s left is for the district to compensate Kelley for his loss. Whatever price the parties settle on, let’s hope the agreement also provides for the removal of the rest of "Wildflower Works I". If it wasn’t an eyesore before—and plenty of people thought it was—it sure is now.

It is implied in the first Paragraph that the public().

A. paid little attention to "Wildflower Works I"

B. appreciated the value of "Wildflower Works I"

C. tolerated the ugliness of "Wildflower Works I"

D. had their own views on "Wildflower Works I\

单项选择题