第5题: [单项选择]以下均为脊髓压迫症的原因,除外()。 A. 神经鞘膜瘤 B. 颈椎融合畸形 C. 第四脑室出口闭塞 D. 黄韧带肥厚 E. 结核 参考答案:C
第6题: [单项选择]The millions of calculations involved, had they been done by hand, ______all practical value by the time they were finished. A. could lose B. would have lost C. might lose D. ought to have lost 参考答案:B 答案解析:这是一个与过去事实相反的虚拟语气句,从句had they been done by hand插在主句中,采用倒装形式省略了连词if,表示非真实条件,主句中有明确的时间状语by the time the
第7题: [单项选择]有A、B、C三种投资产品,其收益的相关系数如下: A. B. A C. B D. C E. A F. 1 G. B H. 0.1 I. 1 J. C K. 0.8 参考答案:A