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问题 单项选择题

全厚皮片的优点（）。

A.外观、功能较满意

B.易成活

C.供区能自行愈合

D.取皮面积不受限制

E.抗感染能力强

答案

参考答案：A

解析：全厚皮片包含皮肤全层组织，成活后的外观、质地和正常皮肤近似。

单项选择题

磁浮子液位计长时间使用后，磁钢的性能出现不稳定现象，甚至导致部分浮子的磁钢和指示器的部分小磁钢的磁性减弱或消失，失去磁钢之间相互的磁耦合作用，从而产生指示器磁钢红白紊乱的情况，称之为（）现象。

A.乱磁现象

B.浮子卡死

C.传感器故障

D.气阻现象
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单项选择题

A study found that 70 percent of children surveyed in 1970 had at one time had cavities, whereas only 50 percent of those surveyed in 1985 had ever had cavities. The researchers concluded that the level of dental disease in children had declined between 1970 and 1985.
Which of the following, if true, would most seriously undermine the researchers’ conclusion presented above

A．Cavities are the most common kind of dental disease to which children are subject.

B．The children surveyed came from a broad variety of income backgrounds.

C．The children surveyed were selected from among students of teachers cooperating with the researchers.

D．The accuracy of cavity detection techniques has improved dramatically since 1970.

E．(E) The children surveyed in 1985 were younger on average than those surveyed in 1970.
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