搭设砌筑竹、木脚手架的外脚手架时,立杆根部必须埋入土中( )以上,脚手架底部应有排水措施。
A. 300mm
B. 280mm
C. 260mm
D. 240mm
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瞎炮的处理方法为:在距爆孑L近旁( )处,重新钻一与之平行的炮眼,然后装药起爆以销毁原有瞎炮,如炮孔底有剩余药,可重新加药起爆。
A. 450mm
B. 500mm
C. 550mm
D. 600mm
共用题干题女性,56岁,间断突发右侧面部闪电样锐痛1个月,疼痛多位于右侧上唇、鼻翼、口角、颊粘膜处,常于进食、洗脸、刷牙时发作,每次持续1~2分钟,发作间期无症状。每日发作约1~2次 如上述检查阴性,你认为最可能的诊断是()
A. 舌咽神经痛
B. 口唇部带状疱疹
C. 原发性三叉神经痛
D. 继发性三叉神经痛
E. 偏头痛
开挖基坑(槽)时,应符合的规定有:为防止坑壁滑塌,根据土质情况及坑(槽)深度,在坑顶两边一定距离(一般为0.8m)内不得堆放弃土,在此距离外堆土高度不应超过( ),否则,应验算边坡的稳定性。
A. 1.2m
B. 1.3m
C. 1.4m
D. 1.5m
The last sentence of the fourth paragraph is intended to tell readers that______.
A. society's demands upon and for clean water are increasing
B. no person has the right to waste water
C. without water, there could be no life
D. everyone should be concerned about how water is used because the water a person uses will be used by future generations