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【简答题】
黄土与古土壤记录如何反映过去的全球变化?
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【单选题】Are organically grown foods the best food choices? The advantages claimed for such foods over conventionally grown and marketed food products are now being debated. Advocates of organic foods frequent...
A.
organic goods can be more expensive but are often no better than conventionally grown foods
B.
many organic foods are actually less nutritious than similar conventionally grown foods
C.
conventionally grown foods are more readily available than organic foods
D.
too many farmers will stop using conventional methods to grow food crops
【单选题】In the doctor's view,_________
A.
there are both advantages and disadvantages of being rich.
B.
traveling a lot will be beneficial to children.
C.
rich children usually.have little confidence in themselves.
D.
rich kids are often short of money because of their life of luxury.
【简答题】设光纤的纤芯折射率n1=1.500,包层折射率n2=1.485。求: (1)相对折射率差Δ; (2)数值孔径NA; (3)入射临界角θmax 。
【单选题】健康教育的隐形课程可分为()和()。
A.
创设健康环境 提供心理服务
B.
创设健康环境 提供咨询服务
C.
创设健康环境 提供健康服务
D.
提供物质环境 创设精神环境
【多选题】Choose the several key advantages of nanocarriers over conventional, molecular agents in medicine.
A.
They enable stable aqueous dispersions of active, but poorly water soluble molecular agents, for delivery.
B.
Nanocarrier should exhibit no toxicity and be safely excreted from the body.
C.
Their composition, size, shape, and surface properties can be tailored so that, they can protect the encapsulated agents from degradation.
D.
Nanocarrier matrix can be designed for controlled release of drugs at target areas for optimal and sustained drug action.
【单选题】This passage mainly deals with ______.
A.
food storage
B.
advantages of canned food
C.
the art of canning
D.
canning food
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