第10题: [单项选择]以下对超声波的生物效应描述不正确的是()。 A. 超声波的热效应可能使细胞组织的温度升高 B. 超声波具有空化效应 C. 超声波的强度小于1W/cm时,诊断超声波对人体不会产生明显的生物效应 D. 超声波的空化效应对细胞无破坏作用 E. 以上都不对 参考答案:D
第11题: [单项选择]{{B}}Questions 11to 18 are based on the conversation you have just heard.{{/B}} A. The course may not be so good now. B. Prof. Smith has retired. C. The course is definitely worthwhile. D. The course is even more interesting now. 参考答案:A 答案解析:[听力原文]
M: I understand that the extra mathematics course this semester is outstanding.
W: It used