高频振荡电感型接近开关主要由感应头、振荡器、开关器、()等组成。
A、发光二极管
B、光电三极管
C、继电器
D、输出电路
参考答案:D
根据句义及所给单词的汉语写出英文单词的正确形式。
1. As the ________ (幕布) rises a dead body is seen on the stage.
2. The only ________ (解释) for his behavior is that he is mad.
3. You will find the stone ________ (珍贵).
4 We had only a week to make for the wedding. (准备)
5. I came ________ (立即) after I had eaten.
6. Everyone should be _________ (尊敬), whether old or young, rich or poor.
7. You're getting fat; you should ________ (锻炼) more.
8. Dogs ________ (认出) people by their smell.
9. As everyone knows, smoking ________ (影响) health.
10. — May I use your car? — No, I ________ (禁止) you to.
被检物体和标准渗透材料应处于规定的温度范围内,下列关于渗透液温度不能过低的原因之一是温度越低()
A、粘度越低
B、粘度越高
C、少量挥发性材料会损失
D、染料会变质