采集设备检验分为（）
A、验收检验
B、型式试验
C、设备抽检
D、全性能检验
参考答案：A, B, D
It was April 29, 2011 ______ Prince William and Kate Middleton walked into the palace hall
of the wedding ceremony. [ ]
A. that
B. when
C. since
D. before
塞尺由一组（）的钢片组成.
A.长度不一
B.宽度不一
C.厚薄不一
D.厚度不一
