柴油机燃烧室按结构形式可分为统一式燃烧室和分开式燃烧室两类。
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仓储技术装备按照作业方式分为搬运机械设备、起重吊装机械和存取设备。
A. 正确
B. 错误
A conscious victim who has suffered a blow to the head has symptoms that indicate the possibility of concussion. If the patient feels no indication of neck or spine injury，recommended treatment would include（）.
A. turning the victim's head to the side to keep his airway open
B. positioning the victim so the head is lower than the body
C. giving the victim water if he is thirsty，but no food
D. elevating the head and shoulders slightly with a pillow
带状切屑的特征是（）。
A. 内表面光滑、外表面呈毛茸状、有剪切的条纹
B. 内表面有时有裂纹
C. 外表面呈锯齿形
D. 呈不规则的碎块
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