在列检作业线路上检查、修理、整备作业时,应在列车两端来车方向的右侧钢轨上,设置带有脱轨器的固定或移动信号牌(灯)进行安全防护。
参考答案:错
扫描电镜的反差是由()决定的。
A.二次电子产率
B.反射电子产率
C.吸收电子产率
D.俄歇电子产率
E.特征X射线产率
Directions:
Write an essay of 160--200 words based on the following picture. In your essay, you should
1) describe the cartoon briefly,
2) interpret its intended meaning, and
3) give your view on the issue.
You should write it neatly on ANSWER SHEET 2.