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在工程网络计划中，对关键线路描述不正确的是（）。
The approximately 65,000 images the Surveyor orbiter has beamed home in the nearly three years it has been circling Mars are full of this kind of expected hydro-scarring. But some of the pictures took scientists by surprise. The older a formation is, the more likely it is to have been distorted over the eons--smoothed by periodic windstorms or gouged by the occasional incoming meteor. However, a few of the newly discovered water channels look flesh. That discovery has lead astonished researchers to conclude that these channels may have been recently formed. Paleontologists have long assumed that if underground water was going to bubble up on Mars, it would have to be somewhere in the balmy equatorial zones, where temperatures at noon in midsummer may reach 68 degrees Fahrenheit (20 degrees Centigrade). Almost all the new channels, however, were discovered at the planet’s relative extremes--north of 30 degrees north latitude and south of 30 degrees south latitude--and all were carved on the cold, shaded sides of slopes.
速度单位中1马赫近似为（）m/s。
颜面部缺损修复的基本原则是（）
水准仪是提供一条水平视线来测定两点间高差的仪器，由望远镜、水准器、（）和三脚架构成。
10～12岁可以利用排齐拥挤前牙的间隙是（ ）。
下列哪些疾病的治疗首选青霉素（）
典型葡萄胎的二维超声表现是（）。
长期人寿保险合同具有（）特征，因此这类合同通常有保单贷款、自动垫交保费等条款，而且保单具有现金价值。
古希腊《希波克拉底全集》包括（）。
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ZPW-2000A型无绝缘移频自动闭塞低频及含义正确的是（）
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ZPW-2000A型无绝缘移频自动闭塞系统，调谐区阻抗频率实际信号有（）的频偏。
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