"激光是电磁波,激光与生物组织的作用实质上是电磁场与生物组织的作用"属于()
A. 热作用
B. 压强作用
C. 光化作用
D. 电磁作用
E. 生物刺激作用
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闭合性气胸积气少于该侧胸腔容积的20%时,气体可在2~3周内自行吸收,不需抽气。
A. 正确
B. 错误
因扑救森林火灾需要,由县级以上人民政府决定征用物资、设备、交通运输工具的,扑火工作结束后,应当如何处置?
What must the Master or person in charge of a ship enter in the logbook after conducting a boat drill? ()
A. Which survival craft was used in the drill
B. The number of each lifeboat not lowered during each drill
C. Only the number of each motor propelled lifeboat that is lowered
D. The length of time an oar propelled lifeboat is rowed
桑塔纳2000GLS型轿车IV型发动机怠速转速在(800±50)r/min时,点火提前角应为()。
A. 11°~13°
B. 11°~12°
C. 10°~11°
D. 9°~10°