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问题 单项选择题

龋齿充填后远期出现继发痛和自发痛，多数是由于

A．充填物有早接触
B．未恢复接触点或形成颈部悬突
C．各洞过程中产热过多
D．继发龋伴牙髓炎
E．充填物压得不紧

答案

参考答案：D

单项选择题

滑坡在其滑动中通常会形成一系列的形态特征，有些形态特征可以作为识别滑坡的重要标志，下列不属于滑坡形态特征的是( )。

A．滑坡体

B．滑动床

C．滑坡舌

D．滑坡墙
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问答题

And we do expect to grow quickly with your help, and this effort will proceed on a number of parallel tracks. First, a major applied research and development effort to improve design, lower costs, and develop global industry standards for cookstoves. There are already some good stoves out there, but we can make them much more durable, efficient, and affordable, and scale up production to reach a mass market. With the right advances, new stoves could even use their own wasted heat to produce electricity that powers smoke-clearing fans, mobile phones, and even household lights.
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