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有些学者将“共同语”和“通用语”合称为“共同语”，它们的实质一样吗？
二冲程摩托车发动机可燃混合气包括（）。
Passage1Children who spend more than two hours a day at a computer or watching television are more likely than others to have mental problems，scientists say.Researchers found that 11-year-olds who spent several hours in front of a screen each day did worse on mental health tests，no matter how much physical exercise they got. The University of Bristol study，published in Pediatrics，involved more than 1，000 children aged about 10.They also had the kids fill out questionnaires designed to gauge the kids' emotional well-being and behavior.The questionnaires contained 20 questions covering five sections-emotional difficulties，conduct problems，hyperactivity or inattention，friendships and peer groups and problems relating to friends and peer groups.The study found no direct evidence that sitting in front of a screen actually causes mental health problems. Instead，it suggests that children with difficulties，such as extreme shyness，are more likely to choose TV or computer games than sociable activities. In the study，children were asked whether they agreed，disagreed or somewhat agree with a list of statements，including，"I generally play alone or keep to myself" and，"I am often unhappy or tearful".They were also asked how much exercise they took and how long they spent at a TV or computer screen.According to the study，children who spent more than two hours a day at a screen had a 60% higher risk of mental problems than children who spent fewer viewing hours. The risk was only slightly higher in children who did little or no exercise."Physical activity is good for health in many ways，but it can't make up for long hours of screen viewing. Parents should consider limiting their children's screen viewing to no more than 2 hours a day，”said the study organizer，Angie Page.Previous studies have raised concerns that watching too much television can affect children's behavior in later life. A Canadian study found that those who watched most TV as young children performed worse at school, ate more junk food and had more trouble concentrating.How did the researchers carry out the study?
（）是以建筑物或构筑物各个分部分项为对象编制的定额。
充当股票承销机构的主要是（）。
服务的核心本质是（）
叶片呈披针形，基部耳状偏斜，不对称，孢子囊群在下表面侧脉间多见的药材是（）
有永久性顶盖的室外楼梯（建筑物无室内楼梯），其建筑面积按建筑物自然层的水平投影面积的计算。
不适宜在CT引导下腹腔穿刺的脏器是（）。
“身教重于言教”是____的作用在教育实践中的表现。