题目内容

Who is the boy talking with

A. [A]His mother.
B. His teacher.
C. The doctor.

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焊条电弧焊施焊前应检查设备绝缘的可靠性、接线的正确性、接地的可靠性、电流调整的可靠性等项目。

A. 对
B. 错

临床上使用的基托材料主要为热凝和自凝基托材料两种，在组成，性能及应用上都不同热凝塑料在临床使用中，最佳充填时期是

A. 湿砂期
B. 糊状期
C. 粘丝期
D. 面团期
E. 橡胶期

A lot of people think that sitting is (36) on their backs than standing or lifting. Not true. People whose jobs require them to sit for long periods of time (37) as much from back pain as people who lift all day long. Many world-class researchers believe that the huge (38) in back pain over the past couple of (39) —and it is huge--has a lot to do with the fact that more and more of us are spending our work days in chairs. Many people have the (40) that, if their back pain gets bad enough, they can always resort to (41) . Nothing could be further from the truth. The amount of pain someone is in has very little to do with whether or not he or she could (42) from surgery. One British researcher has (43) that for every 10,000 people who experience about back pain, only four need surgery. (44) . No longer. Two or three days of bed-rest is now the norm. After that, people are advised to return to their normal activities, gradually if necessary. The reasons for the 180° shift are what’s interesting. For openers, (45) . In our next lecture, we shall look at the relation between depression and chronic back pain. (46) .

在程序设计阶段应该采取【2】和逐步求精的方法，把一个模块的功能逐步分解，细化为一系列具体的步骤，进而用某种程序设计语言写成程序。