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问题 单项选择题

一老年患者突然出现头痛、呕吐、右肢力弱、言语不能。病前曾有脑外伤史。诊断首先考虑（）

A.硬膜下出血

B.脑肿瘤

C.脑梗死

D.脱髓鞘

E.脑出血

答案

参考答案：A

单项选择题

Ralph & Sons, Inc., uses the straight-line method of depreciation for its long-lived assets. After a recent meeting with the independent accountants where industry depreciation practices were discussed, Ralph decided to switch to the double-declining balance method. In the year in which the switch occurs, Ralph should report this change as:（）

A. a change in accounting principle and report its effect on prior period results as a non-recurring item, net of tax.  

B. an accounting error and directly adjust retained earnings.  

C. a change in accounting principle and report its effect on prior earnings as part of operating earnings.
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单项选择题

为消除静电，一般接地电阻应低于（）。

A、4Ω

B、40Ω

C、400Ω

D、4kΩ
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