从某金属表面逸出光电子的最大初动能Ekm与入射光的频率u的图象如图所示,则这种金

题型:填空题

问题:

从某金属表面逸出光电子的最大初动能Ekm与入射光的频率u的图象如图所示,则这种金属的截止频率是___Hz;普朗克常量是____J·s。

考点:光电效应实验规律
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病人老年男性,78岁。有发作性胸骨后压榨样疼痛,病史4~5年,疼痛每次持续2~3分钟,含服硝酸甘油症状能缓解,本次因大便用力后,突然胸闷、胸痛伴紫绀,出冷汗,救护车送到医院时心跳、呼吸停止。

请问该病人心源性猝死可能的病因是()。

A.心肌病

B.冠心病

C.恶性心律失常

D.急性泵衰竭

E.病态窦房结综合征

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男性,25岁,近年夜尿增多,偶有水肿。BP190/110mmHg,Hb60g/L,尿蛋白(+),RBC0~1个/HP,WBC0~1个/HP,颗粒管型1~2个/HP,肌酐清除率降低,应诊断为 【 】

A.急性肾炎

B.急进性肾炎

C.隐匿性肾炎

D.慢性肾炎

E.高血压病肾动脉硬化

题型:填空题

根据领导生命周期理论,对于新上岗的护士应该采取的领导方式是 ()

A.高工作,高关系

B.高工作,低关系

C.中工作,中关系

D.低工作,高关系

E.低工作,低关系

题型:填空题


A How to Use a Painting Knife 使用画刀的方法
Painting with a knife is a bit like putting butter on bread and produces quite a (1) result to a brush. Painting knives are excellent for producing textured, impasto work and (2) areas of flat colour.
What’s the difference between a palette knife and a painting knife
A palette knife is a long, straight spatula that is used (3) mixing paints and scraping a palette clean. They’re made from metal, plastic, or wood and (4) either be completely straight or have a slightly bent handle. A painting knife has (5) large crank in the handle, which takes your hand away from the painting surface. They (6) in numerous shapes(for example pear-, diamond-, or trowel-shaped) and are used for painting (7) of a brush. The edge of the knife is blunt, so that it doesn’t cut the (8) .
·What shape of painting knife should I use
Different shaped painting knives produce different effects. For example, a short blade produces angular strokes (9)a long blade makes it easy to put down sweeps of colour.
·Why can’t I use a palette knife to paint with
You can. Painting (10) just have the advantage of coming in more angular shapes and with sharper points. And (11) larger crank in the handle means there’s less chance of rubbing your knuckles into wet (12) . If you’re unsure whether you’re going to enjoy painting with a knife, first buy a (13) , plastic palette knife and experiment a bit with this before upgrading to a wood-and-metal knife.
·How do I use painting knife
(14) the handle firmly so you’re got good control. Pick up some paint off your palette (15) the tip, as you’d pick up some butter with a knife. Use the side of the (16) to spread paint across your canvas, or press it onto the canvas, as you (17) spread butter across a slice of bread.It’ll seem strange at first as it’s quite (18) to using a brush. Using just the tip of the blade will produce small dots. (19) the edge of the knife down will produce fine lines. Pressing the blade flat down (20) the paint will produce ridges. Scrape back into the paint to reveal underlying layers (called sgraffito).

题型:填空题

锅炉压力保护只适用于停炉时间不超过()的锅炉。

A、1周

B、2周

C、3周

D、4周

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