对楼地面的要求在______下,不应变形或破坏,在人们经常的活动中不易被磨损。
A.作用
B.冲击
C.荷载
D.腐蚀
参考答案:C
He didn't want his friends ____________ about him.[ ]
A. know
B. to know
C. knowing
某患者自诉乳腺可触及一包块,光滑可移动,声图像如图,诊断为()
A.纤维瘤
B.囊肿
C.乳腺癌
D.小叶增生
E.乳腺导管扩张