血液的粘滞性是由于血液内部的分子或颗粒之间的摩擦力而形成。
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血浆pH保持7.35~7.45反映了机体内环境的稳态。
A. 对
B. 错
渗透压的大小,取决于单位体积溶液中溶质颗粒的大小,而与颗粒数目的多少无关。
A. 对
B. 错
各种等渗溶液均能使悬浮于其中的RBC保持正常形态。
A. 对
B. 错
Section ADirections:In this section, you will hear three news reports. At the end of each news report, you will hear two or three questions. Both the news report and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D). Then mark the corresponding letter onAnswer Sheet 1with a single line through the centre.[音频]
A. Questions 1 and 2 are based on the news report you have just heard.A)Land a space vehicle on the moon in 2019.
B)Design a new generation of mobile phones.
C)Set up a mobile phone network on the moon.
D)Gather data from the moon with a tiny device.