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【简答题】
Many people often _______ are afraid of at least one type of animal. You can know a person for years. You can think you know everything about them, but then one day, you are with the person when they catch _______ of a picture in a magazine. Quick as a flash, the magazine is flying across the room, thrown from their hands in fear. The pages fall open again, _______ a photo of a nasty looking snake. Another scream and then you realize your friend has an animal phobia. Or another friend turns down your invitation to _______ you and the children to the zoo. Know, they are sorry, but they are really busy, really tired, really. And in the end, they tell you, actually, they are simply afraid you will make them go into the spider house and you and the children will see just how scared they really are of our eight-leg friends. It is true there are some fears of animals out there. The spider as _______, the snake and the great white shark, are all out there on the top ten of the world’s most feared animals. And it’s not difficult to see why. The thought of a great white shark keeps many people on the beaches and out of the ocean. Growing to over five meters long with hundreds of teeth and a desire to eat fresh flesh, whether it be fish, seal, _______ or astray human, these animals are high on the list of most feared animals. It does not however, make many people feel better when they learn that great white sharks are responsible for fewer than 20 human deaths per year. Then there’s the snake. Now these are responsible for many human deaths, up to 100,000 annually. _______ and understandably, over half the human population is afraid of snakes, though they could perhaps be more _______ with their fear. Only 10% of all snakes are deadly, the others just looking. Spiders are another of the top favorites for fearing and this fear can be more powerful and more controlling than the others. Spiders after all are everywhere inside houses as well as out. But although there are many different types of spiders, like snakes, only a few actually bite humans. And only 5 types are _______ enough to kill human. So when your friend is having a panic attack about the shark, the snake or the deadly spider they will never meet, it is worth reminding them that in the US, on average, these animals are responsible on 1, 5.5 and 6.5 human deaths per year _______. On the other hand, it is men’s best friends—the dog that is responsible for 31 US deaths annually. Know your friend, know your enemy.
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【判断题】科学、合理的营养配餐方案及个性化的食谱制定可指导大众健身,同时可服务于健身会馆、餐饮企业,院校、中小学、幼儿园等机构。
A.
正确
B.
错误
【单选题】硫酸-亚硝酸钠反应鉴别巴比妥类药物的现象是
A.
生成橙黄色产物,并随即转变为紫色
B.
生成红色产物,并随即转变为黄色
C.
生成橙黄色产物,并随即转变为橙红色
D.
生成橙红色产物,并随即溶解
E.
先无现象,稍待片刻有黑色产物生成,加氨后溶解
【简答题】试说明图所示振荡电路的名称,以及石英晶体在电路中的作用。
【判断题】科学、合理的营养素配餐方案及个性化的食谱制定可指导大众健身,同时可服务于健身会馆、餐饮企业,院校、中小学、幼儿园等机构
A.
正确
B.
错误
【多选题】石英晶体构成的正弦波振荡电路的基本电路有:
A.
并联型晶体振荡电路
B.
变压器反馈式晶体振荡电路
C.
串联型晶体振荡电路
【单选题】硫酸-亚硝酸钠反应鉴别巴比妥药物的现象是( )
A.
生成橙色产物,并随即转变为紫色
B.
生成红色产物,并随即转变为黄色
C.
生成橙黄色产物,并随即转变为橙红色
D.
生成橙红色产物,并随即溶解
【单选题】硫酸 — 亚硝酸钠反应鉴别巴比妥药物的现象是
A.
生成橙色产物,并随即转变为紫色
B.
生成红色产物,并随即转变为黄色
C.
生成橙黄色产物,井随即转变为橙红色
D.
生成橙红色产物,并随即溶解
【单选题】某烷烃的相对分子量为 86g/mol, 其一溴代物只有两种,则该烷烃是( )
A.
正己烷
B.
2- 甲基戊烷
C.
2,3- 二甲基丁烷
D.
2,2,4,4- 四甲基戊烷
【单选题】硫酸—亚硝酸钠反应鉴别巴比妥药物的现象是( )
A.
生成橙色产物,并随即转变为紫色
B.
生成红色产物,并随即转变为黄色
C.
生成橙黄色产物,井随即转变为橙红色
D.
生成橙红色产物,并随即溶解
E.
生成黑色产物,并溶于氨溶液
【简答题】某石英晶体振荡电路如图7-16所示。 (1) 分析石英晶体的阻抗-频率特性; (2) 求电路的振荡频率。
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