分化低的乳癌是()
A.硬癌、腺癌
B.髓样癌、胶样癌
C.导管癌、 * * 状癌
D.弥漫型癌、湿疹样癌
E.硬癌、导管癌
参考答案:B
A study shows that students living in non?smoking dorms are less likely to _____ the habit of smoking. [ ]
A. make up
B. pick up
C. draw up
D. turn up
简述气动系统的主要缺点。