在施工质量保证体系的运行中，( )包括对质量活动结果的评价认定和对质量偏差的纠正。
A．系统控制B．事后控制C．事中控制D．事前控制
参考答案：B
The children went home from the grammar school, their lessons____ for the day. [ ]
A. finishing
B. finished
C. had finished
D. went finished
Ficoll淋巴细胞分离液的密度为（）
A.1.030～1.035
B.1.035±0.001
C.1.077±0.001
D.1.075～1.092
E.1.076～1.090
