问题
单项选择题
超声检测的局限性在于（）。
A．不可用于金属、非金属和复合材料制件的无损评价
B．对材料及制件缺陷作精确的定性、定量表征仍需作深入研究
C．在金属中传播的距离较短，故不能用来探测大厚度工件
D．对检测裂缝等平面型缺陷灵敏度较低
答案
参考答案：B
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超声检测的局限性在于（）。
A．不可用于金属、非金属和复合材料制件的无损评价
B．对材料及制件缺陷作精确的定性、定量表征仍需作深入研究
C．在金属中传播的距离较短，故不能用来探测大厚度工件
D．对检测裂缝等平面型缺陷灵敏度较低
参考答案：B
| 阅读短文，还原句子。 | |
| Wilma Rudolf was born in Clarksville, Tennessee, in 1940. There were twenty-two children in her family. Wilma was not a strong child. When she was very young her leg began to have problems. Wilma's family loved her and helped her. Her mother and her sisters massaged (按摩) her bad leg. The doctor put a brace (矫形支架) on her leg for six years. 1______ At high school Wilma started to run. Soon she won every race she ran. Then she prepared for the national races. 2______ The next year, 1956, Wilma was in the Olympic Games in Australia. Wilma came back with a bronze medal. In 1960, Wilma went to the Olympic Games in Italy. The weather was very hot just as it was it Tennessee. The Italians cheered her. Wilma won the 100-meter race, the 200-meter race, and the 400-meter relay. 3______ 4______ That year she married her high school sweetheart, and now they have four children. | |
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