暗龙骨吊顶工程的吊杆.龙骨和饰面材料的安装必须牢固,检验方法有()
A.观察
B.手扳检查
C.检查隐蔽工程验收记录
D.检查施工记录
参考答案:A, B, C, D
This is the first time that I _____ the summer palace.
A.had visited
B.have visited
C.visit
D.visited
______÷24=0.25=10:______=______%