砂浆回弹法在每个测位内，测碳化深度时，应选择3处灰缝，凿出孔洞直径约为（）。
A.5mm
B.10mm
C.15mm
D.20mm
参考答案：B
The news reporters hurried to the airport, only _________ the film stars had left.
A to tell B to be told C telling D told
半夏与生姜的配伍关系是（）
A.相使
B.相须
C.相畏
D.相恶
E.相杀
