混凝土振捣时，棒头伸入下层（ ）
A. 3~5cm
B. 5~10cm
C. 10~15cm
D. 20cm
现浇混凝土结构现浇混凝土井筒长度对中心线的允许偏差为（ ）
A. ±25mm
B. +0mm，-25mm
C. +25mm，-0mm
D. ±0mm
According to the passage, human beings can survive almost everywhere on Earth because______.
A. they have developed advanced forms of transportation
B. they have learned how to process seawater for drinking
C. their body temperature can vary considerably
D. their shelters and clothes help them to adapt themselves to the environment
男性，55岁。右侧唇红部出现白色斑块 1年求诊。无自觉症状。患者有烟酒嗜好。口腔检查：右侧唇红部可见一白色斑块，均质状，不能被擦去，涂片镜检3次未找到芽胞或菌丝。不恰当的处理是
A. 停止吸烟
B. 口服维生素A
C. 0.2%维甲酸局部涂擦
D. 硝酸银局部处理白色斑块
E. 定期随访，如出现恶变指征应立即切除
微信支付 
支付宝支付