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问题 填空题

方程2x2-3x-4=0的根的情况是______．

答案

∵△=（-3）2-4×2×（-4）=41＞0，

∴方程有两个不相等的实数根．

故答案为方程有两个不相等的实数根．

单项选择题

Of 40 applicants for a job, 32 had at least 5 years of prior work experience, 24 had advanced degrees, and i6 had at least 5 years of prior work experience and advanced degrees. How many of the applicants had neither 5 years of prior work experience nor advanced degrees ？（）

A. 0

B. 2

C. 4

D. 8

E. 16
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单项选择题

急性 * * 炎（）

A．周期性疼痛

B．肿块增长缓慢，边界清楚且能推动

C．肿块固定且腋窝淋巴结肿大

D． * * 血性溢液

E．早期患侧 * * 肿痛伴发热
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