绘图题：画出玻璃电极的结构图。_爱下问搜题

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问题问答题简答题

绘图题：画出玻璃电极的结构图。

答案

参考答案：

完形填空

One day, a farmer’s donkey fell into a dried up well. The animal cried 16 for hours as the farmer tried to 17 what to do. Finally, he decided that the animal was 18 , the well needed to be covered up, and 19 the donkey just wasn’t worth the 20 , so he invited his neighbors to 21 and help him bury the donkey in the well. They all held shovels (铲) and begin to shovel 22 into the well. At first, the donkey 23 what was happing and 24 cried pitifully. Then, to everyone’s 25 , he quieted down. A few shovel loads later, the farmer finally looked 26 into the well and was 27 at what he saw. 28 each shovel load of dirt that hit his back, the donkey 29 something surprising. He shook it off and took a step up! As the farmer’s neighbors 30 to shovel dirt 31 the animal, he would shake it off and take a step up. The donkey stepped 32 over the edge of the well! As with the donkey, 33 is going to shovel dirt 34 you, all kinds of dirt. We can get out of the deepest wells just by not stopping, by never giving 35 .

A．come around

C．disappoint ment

A．at the top of

C．at the foot of

D．in front of

B．successfully

单项选择题

实验室应确保具备足够的有适当防护水平的（）可供使用。

A.口罩

B.水杯

C.工作服

D.清洁防护服