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问题 单项选择题

为防止游离端基托沿支点线向脱位，最好的设计是（）。

A.基牙使用BPI或RPA卡环

B.基牙选用近中支托

C.扩大基托伸展范围

D.使用前牙舌侧支托

E.以上全不是

答案

参考答案：D

单项选择题

Software engineering is the science and art of specifying, designing, implementing, and (66) with economy, timeliness and elegance, programs, (67) and operating procedures whereby computers can be made useful to humanity.

This definition implicitly sets (68) the basic goal of software engineering research and development: The basic goal of software engineering is to facilitate specification, design, implementation and evolution of programs, documentation and operating (69) which are useful to humanity in an economic, (70) and elegant manner (using the appropriate science and art).

（66）处填（）。

A．envelopment

B．enveloping

C．evolvement

D．evolving
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选择题

下列实验操作中错误的是（   ）

A．分液时，分液漏斗中下层液体从下口放出，上层液体从上口倒出

B．蒸馏时，应该使温度计的水银球靠近蒸馏烧瓶支管口略下一点

C．不慎将酸溅到眼中，应立即用水冲洗，边洗边眨眼睛

D．在进行蒸发实验时，一定要将液体全部蒸干，然后再停止加热
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