某焊接工字形截面梁,翼缘板宽250,厚18,腹板高600,厚10,钢材Q235,受弯

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问题:

某焊接工字形截面梁,翼缘板宽250,厚18,腹板高600,厚10,钢材Q235,受弯计算时钢材的强度应为()

A.A

B.B

C.C

D.D

考点:机械工程钢结构设计原理钢结构设计原理题库
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若分式
a2
3a-12
的值为负,则a的取值范围为______.
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患者因皮肤疮痍破溃而引发水肿,肿势自颜面而渐及全身,发热咽红,舌红苔薄黄,脉滑数。其治法是:( )

A.温运脾阳,以利水湿

B.健脾化湿,通阳利水

C.宣肺解毒,利湿消肿

D.散风清热,宣肺利水

E.温肾助阳,化气行水

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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) .

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肿瘤细胞的异型性主要是指胞核的多形性。

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距离丈量的结果是求得两点间的()。

A.斜线距离

B.水平距离

C.折线距离

D.斜距离

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