已知:①x=1;②x﹣1=12;③x2+2x+1=0;④xy=1;⑤x+y=0,

题型:选择题

问题:

已知:①x=1;②x﹣1=12;③x2+2x+1=0;④xy=1;⑤x+y=0,其中是一元一次方程的有[ ]

A.1个

B.2个

C.3个

D.4个

考点:一元一次方程的定义
题型:选择题

善意取得的构成要件不包括()。

A.受让人已经占有了该财产

B.以垄断的价格取得

C.受让人须是善意的

D.受让人必须支付了合理的价款

题型:选择题

调节阀的气开、气关选择原则是怎样确定的?单参数控制系统中,调节器的正、反作用又是如何定的?

题型:选择题

Today, we’ll talk about what other effects watching TV might produce on children. Children should be (1) a lot of television, many experts and parents agree, but there is at least one circumstance when it might be beneficial: (2) . A recent study conducted by Italian researchers found that children (3) immediately preceding and during blood tests experienced less pain than children whose mothers (4) during the procedure, or children whose mothers were present but (5) .
The research, led by Carlo Brown, MD, at the University of Siena, is published in the Archives of Disease in Childhood. (6) the study. None received any type of anesthesia; the children and their mothers (7) . Both the group whose mothers attempted to distract them from the blood tests and those whose mothers simply observed reported (8) than the group who watched cartoons. For that group, the levels of pain were less and the children were better able to (9) .
One of the possible explanations is that children might have (10) during the procedures, exacerbating their perception of pain. "The higher pain level reported by children during (11) shows the difficulty mothers have in interacting positively (12) in their children’s life," the authors write.
However, they stressed that (13) still provided benefits, noting that the children would (14) during the procedures. "Indeed, children state that having their parent present (15) when in pain," say the authors.
Another possibility offered for consideration is the notion that the (16) might release pain-quelling endorphins. Endorphins, (17) produced by the pituitary gland, resemble opiates in their ability to produce analgesia and a sense of well-being. In other words, they might (18) .
In any case, the study results suggest that health workers should (19) to watch television during painful procedures (20) .

题型:选择题

男孩6岁,因阵发性右腹痛2天入院。既往有排蛔虫史。入院考虑胆道蛔虫症,其临床特点是()

A.腹痛症状与体征较轻微

B.腹痛症状与体征明显

C.腹痛伴发热及黄疸

D.腹痛症状重而体征少

E.腹痛伴黄疸及腹部包块

题型:选择题

男性,40岁,阵发性血压高1年,经血、尿儿茶酚胺及其代谢物测定和其他相关检查不能完全排除嗜铬细胞瘤的诊断,有助于进一步诊断的是()

A.24小时动态血压监测

B.基础代谢率测定

C.酚妥拉明试验

D.ACTH兴奋试验

E.美替拉酮试验

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