与吸烟有重要关系的肺部疾病包括（）
A.慢性支气管炎
B.肺气肿
C.肺硅沉着病
D.肺癌
参考答案：A, B, D
“I was in centre school” “_____”
A．So were we
B．So we were
C．We were so
D．So did we
刀具长度偏移方向为“+”时，应采用（）
A、G41
B、G42
C、G43
D、G44
