金属拉伸试验时,试样发生屈服而力首次下降前的最高应力为()。
A.下屈服强度
B.最大屈服强度
C.极限屈服强度
D.上屈服强度
参考答案:D
女性,65岁,发现左乳肿块约5cm×6cm,与皮肤有粘连,活动度好,左腋下触及肿大淋巴结。腰椎摄片发现L、L有骨质破坏症状。
病人首先应诊断为()
A.乳腺癌
B.乳腺纤维瘤
C.乳腺结核
D.乳腺囊性增生病
E.乳腺肉瘤
(2012·衡阳高二检测) People often have the belief _______ a healthy environment and development cannot be possible at the same time, but this does not have to be true.
A.that
B.which
C.where
D.what