在质量为M的电动机飞轮上固定着一个质量为m的重物，重物到转轴的距离为r，如图所示

下列关于主动脉病变X线表现，错误的是（）

A.主动脉位置改变

B.主动脉狭小

C.主动脉外形不规则

D.主动脉增宽，伸长和迂曲

E.以上都不是

They went on working _______ it was very late. [ ]

A. than

B. if

C. though

D. because

* * 的紫红或紫蓝色结节一般见于（）。

A.子宫体癌

B.绒毛膜癌

C.恶性淋巴瘤

D.侵袭性（恶性）葡萄胎

E.子宫颈癌

对硬铝合金制件最好在完成下列哪项工序之后，立即进行机械加工？（）

A.加热。

B.阳极化处理。

C.淬火。

D.时效处理。

An analyst does research about the impact of tax rate changes on a company's financial statements. For existing deferred tax assets and liabilities, an increase in income tax rate:

A. increases both deferred tax assets and deferred tax liabilities.
B. decreases both deferred tax assets and deferred tax liabilities.
C. decreases deferred tax assets and increases deferred tax liabilities.