液压电梯上常用单作用柱塞缸；即柱塞在压力油的作用下，只能向单一方向运动（）
参考答案：对
手工电弧焊的热影响区主要包括不完全熔化区、（）区、（）区、不完全（）区。
When assessing a preschooler who has sustained a head trauma, the nurse notes that the child appears to be obtunded. Which of the following denotes the child’s level of consciousness（）
A. No motor or verbal response to noxious (painful) stimuli.
B. Remains in a deep sleep; responsive only to vigorous and repeated stimulation.
C. Can be aroused with stimulation.
D. Limited spontaneous movement; sluggish speech.
