碗扣式钢管脚手架
参考答案：
采用碗扣盖固节点的承插式钢管脚手架和模板支撑架。
____several times，but unfortunately，the boy still couldn’t smooth away the problem on his own.
A．Having been explained
B．The problem having been explained
C．The problem had been explained
D．Although the problem had been explained
40岁女性，舌侧尖斜行折断2d，松动，颊侧半稳。叩诊轻度不适，牙冠稍短，口内余留牙及黏膜无异常。
如确定原因为咬合创伤，正确的处理方法是（）
A．拆除修复体
B．调
C．牙周治疗
D．拔除患牙
E．不用处理
舌侧尖斜行折断2d，松动，颊侧半稳。叩诊轻度不适，牙冠稍短，口内余留牙及黏膜无异常。