属于禾本科的是（）。 ["黑麦草","芦荟","笋竹","水仙"]
钣金工最常用的量具一般普通尺有（） ["卡尺","千分尺","木折尺","钢板尺","钢圈尺"]
HDPE挤压机主电机轴承依靠（）方式冷却 ["油","风","循环水"]
（）水准测量用于全国一、二，三等水准网的进一步加密。 ["四等","五等","一、二导线","以上都不对"]
脊髓亚急性联合变性的损害部位为（） ["胸腰段脊髓后索","胸腰段脊髓后索和（或）侧索","颈胸段脊髓后索","颈胸段脊髓后索和（或）侧索","全脊髓后索"]
简述防止杂环胺危害的措施
