法兰从结构上可分为：松式法兰、（）法兰、（）法兰。

[单选题]BC012 NPT5型空气压缩机的转速为（）。

[多选题]快速客车转向架部分主要运用维修限度有（）。

[单选题]我国古代著名科学家沈括和郭守敬在下列哪些领域中作出了卓越贡献？（）

[单选题]请阅读 Passage 2,完成第 26~30小题。Passage 2It's no surprise that Jennifer Senior's insightful, provocative magazine cover story, "I love My Children, I Hate My Life," is arousing much chatter-nothing gets people talking like the suggestion that child rearing is anything less than a completely fulfilling, life-enriching experience. Rather than concluding that children make parents either happy or miserable, Senior suggests we need to redefine happiness: instead of thinking of it as something that can be measured by moment-to-moment joy, we should consider being happy as a past-tense condition. Even though the day-to-day experience of raising kids can be soul-crushingly hard, Senior writes that"the very things that in the moment dampen our moods can later be sources of intense gratification and delight."The magazine cover showing an attractive mother holding a cute baby is hardly the only Madonna-and-child image on newsstands this week. There are also stories about newly adoptive-and newly single-mom Sandra Bullock, as well as the usual"Jennifer Aniston is pregnant" news. Practically every week features at least one celebrity mom, or mom-to-be, smiling on the newsstands.In a society that so persistently celebrates procreation, is it any wonder that admitting you regret having children is equivalent to admitting you support kitten-killing? It doesn't seem quite fair, then, to compare the regrets of parents to the regrets of the childless. Unhappy parents rarely are provoked to wonder if they shouldn't have had kids, but unhappy childless folks are bothered with the message that children are the single most important thing in the world: obviously their misery must be a direct result of the gaping baby-size holes in their lives.Of course, the image of parenthood that celebrity magazines like Us Weekly and People present is hugely unrealistic, especially when the parents are single mothers like Bullock. According to several studies concluding that parents are less happy than childless couples, single parents are the least happy of all. No shock there, considering how much work it is to raise a kid without a partner to lean on; yet to hear Sandra and Britney tell it, raising a kid on their "own" (read: with round-the-clock help) is a piece of cake.It's hard to imagine that many people are dumb enough to want children just because Reese and Angelina make it look so glamorous: most adults understand that a baby is not a haircut. But it's interesting to wonder if the images we see every week of stress-free, happiness-enhancing parenthood aren't in some small, subconscious way contributing to our own dissatisfactions with the actual experience, in the same way that a small part of us hoped getting"the Rachel" might make us look just a little bit like Jennifer Aniston.It is suggested in Paragraph 3 that childless folks ____.

[问答题]有机氯农药和多氯联苯在生物体内是如何积累和转移的？

[多选题]政府审计、内部审计、注册会计师审计共同构成了审计的监督体系。其中，政府审计与注册会计师审计在（　）方面是不同的。

[单选题]我国基层秘书部门设置特点具有（）

[单选题]EXCEL2003中，在单元格中输入=20<>AVERAGE（7，9），将显示（）。

[单选题]AM-96型转向架二系悬挂系统共有（）减震器。

[多选题]神经型食物中毒注射多效价抗毒素最有效的时间为（）

[填空题]法兰从结构上可分为：松式法兰、（）法兰、（）法兰。

[多选题]压力容器法兰按结构可分为（）。

[单选题]法兰按用途可分为管法兰和（）。

[单选题]下心盘从结构上分可分为（）。

[填空题]按窑的结构可分为立窑和（）。

[问答题]液膜根据结构可分为哪些？

[单选题]下心盘从结构上分可分为（）。

[单选题]皂苷按其苷元结构可分为（）

[问答题]冲裁模按结构可分为哪些？

[填空题]根据毛的结构特点，可分为（）毛、（）毛和（）毛。