骨骼系统X线检查主要采用
A．透视
B．普通摄片
C．床头摄影
D．间接摄影
E．钼靶摄影
参考答案：B
The teaching building ________ 10 years ago, but it looks quite new now. [ ]
A. built
B. was built
C. has built
D. is built
报关企业及其跨关区分支机构注册登记许可的有效期均为3年。 ( )
