轻钢龙骨石膏板吊顶工艺。
参考答案:
施工准备;吊件的加工与固定;选用吊杆;安装与调平龙骨架;龙骨安装质量检查;安装石膏饰面板;后续工艺。
No senator spoke at the convention unless he or she was a Democrat. No Democrat both spoke at the convention and was a senator. Which one of the following conclusions can be correctly drawn from the statements above
A.No one but senators spoke at the convention.
B.No Democrat spoke at the convention.
C.Only Democrats spoke at the convention.
D.No senator spoke at the convention.
E.(E) Some Democrat senators spoke at the convention.
装配图中的主视图主要表示了各零件的相对位置及大部分零件的()。
A.外形尺寸
B.主要配合尺寸
C.连接形式
D.结构形式