市场分割理论具有明显的缺陷，持这种观点的投资者越来越少。()
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男性，26岁，突然上腹剧痛，不能直腰，于发病30分钟后来诊。查体：BP14.7/10.7kPa(110/80mmHg)，P110次/分，板状腹，肠鸣音消失，血Hb12.1g/dl，WBC7×10 9/L，尿淀粉酶128U/L
有意义的首选检查方法是
A. 腹部CT
B. 立位腹平片
C. 腹部B超
D. 腹腔灌洗
E. 生化检查
收入费用的确认应当以其实际发生作为确认计量的标准的会计核算原则是()原则。
A. 配比
B. 客观性
C. 权责发生制
D. 历史成本
If a contractual offer can be accepted by post, the acceptance is effective when______.
A. the offeror acts upon it
B. it comes to the offeror's attention
C. it is delivered
D. it is posted
It has often been said that a guarantee is the easiest form. of security to take but the most difficult to realize because of the following reasons except that______.
A. the guarantee has intrinsic value which is difficult to realize
B. the guarantor's financial position may deteriorate without the bank's knowledge
C. guarantors never expect to pay and often refuse to do so, making realization a difficult and lengthy process
D. there may be a reluctance to enforce the security where the guarantor is a valued and influential customer of the bank
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