光面滚筒和胶面滚筒的区别？
参考答案：
光面滚筒适用于功率不大、环境湿度小的场合；
胶面滚筒适用于功率大、环境湿度大、易打滑的场合。
He () the meeting, but upon learning that they would discuss something irrelevant to his field of study, he dropped the idea.
A. were going to attend
B. had attended
C. were to attend
D. would have attended
下述哪些现象不是晚期乳腺癌的表现（）
A. * * 及周围有广泛的皮肤水肿
B.患侧手臂水肿
C.锁骨上淋巴结转移
D.患侧腋下多个淋巴结肿大
E.炎性癌
