生物安全水平二级及以上的实验室，进行生物材料匀浆或搅拌操作时，应在（）开启。

[单选题]Passage2      Old stereotypes diehard. Picture a video-game player and you will likely imagine a teenage boy, byhimself, compulsively hammering away at a game involving rayguns and aliensthat splatter when blasted. Ten years ago that might have borne some relationto reality. But today a gamer is as likely to be a middle-aged commuterplaying  "Angry Birds" on hersmartphone. In America, the biggest market, the average game-player is 37 yearsold. Two-fifths are female.      Over the past tenyears the video-game industry has grown from a small business to a huge, mainstreamone. With global sales of $56 billion in 2010, it is more than twice the sizeof the recorded-music industry. Despite the downturn, it is growing by almost9% a year.     Is this success dueto luck or skill? The answer matters, because the rest of the entertainmentindustry has tended to treat gaming as being a lucky beneficiary of broadertechnological changes. Video gaming, unlike music, film or television, had theluck to be born digital. In fact, there is plenty  for old media to learn.     Video games have certainly been swept along bytwo forces: demography and technology. The first gaming generation-the childrenof the 1970s and early 1980s-is now over 30. Many still love gaming, and canafford to spend far more on it now. Meanwhile rapid improvements in computingpower have allowed game designers to offer experiences that are now often morecinematic than the cinema.      But even grantedthis good fortune, the game-makers have been clever. They have reached out tonew customers with new methods. They have branched out into education,corporate training and even warfare, and have embraced digital downloads andmobile devices with enthusiasm. Though big-budget games are still popular, muchof the growth now comes from  "casual" games that are simple, cheap and playable in shortbursts on mobile phones or in web browsers.      The industry hasexcelled in a particular area-pricing. In an era when people are disinclined topay for content on the web, games publishers were quick to develop"freemium" models, where you rely on non-paying customers to build anaudience and then extract cash only from a fanatical few.Asgaming comes to be seen as just another medium, its tech-savvy approach could provide awelcome shot in the arm for existing media groups.The two examples in Paragraph l are used to illustrate that_____.

[多选题]中餐点餐应注意的禁忌（）

[单选题]赌博成瘾大致分为四个阶段，正确的排序是（）

[单选题]某犬，1周前发热、呕吐、腹泻，现在眼角膜呈浅蓝色浑浊，表面光滑，侧面视诊浑浊表面有薄的透明层，该犬所患眼病是（）。

[多选题]分化良好型脂肪肉瘤的亚型包括（）。

[多选题]最大自主通气量可用来评估（）

[问答题]石油被称为工业“血液”。世界石油资源分布不均，有世界石油宝库之称的波斯湾海底、沿岸蕴藏着占全世界一半以上的石油储量。请问波斯湾沿岸有那些国家？

[多选题]社会保险水平应当（）相适应。

[单选题]下呼吸道感染在临床诊断的基础上，痰培养定量结果符合下述哪一项即可诊断？（　　）

[多选题]全麻药减低兴奋性递质受体敏感性的可能机制为（）

涉密人员的涉密等级分为哪几个等级？