单项选择题
下列各项中是渗透检测特点没有的是( )。
- A.除了疏松多孔性材料外任何种类的材料,如钢铁材料、有色金属、陶瓷材料和塑料等材料的表面开口缺陷都可用渗透检测
B．检验灵敏度高,可以发现极细小的裂纹以及其他缺陷,检验成本很低,速度快
C．形状复杂的部件也可用渗透检测,并一次操作就可以做到全面的检测
D．试件表面光洁度对检测结果影响大,探伤结果往往易受操作人员技术水平的影响
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听力原文： With the development of science and technology, people have more spare time. But how do we spend the free time? I prefer to go outdoors and spend my free time in some different places and with some different people. The first reason for outdoor activities is that I have spent too much time indoors. Most of the time I sit in the classroom, listening to the teachers and doing my exercises. The indoor activities are too limited. Fresh air, sunlight and enough physical exercises are needed for a healthy body. So when I am free, I should go out. The second reason is that I want to have more experiences in my life. When you go out, far away from your daily life, you will meet a lot of people who are quite different from you. It will give you a lot of exciting experiences. However, outdoor activities will take a lot of money and energy. So if you have not prepared enough, having some amusement indoors is also a good choice, which may be much cheaper and easier to carry out. Reading books and enjoying music are also very good.What does the speaker prefer to do to spend the spare time?A．Stay at home.B．Go outdoors.C．Watch TV.
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