以下哪些在MRI上均无信号或低信号改变（）

A.含气鼻窦腔

B.乳突气房

C.硬脑膜

D.颅骨内外板

E.颅骨板障

With respect to tangible fixed assets, SFAS 143 requires that the capitalized value of an asset:（）

A. be recorded on the balance sheet based on the market value at the time of acquisition less the cost associated with any ARO (asset retirement obligation).

B. should include the future value of any ARO which is also recorded as a liability at the time of acquisition.

C. should include the present value of any ARO which is also recorded as a liability at the time of acquisition.