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【多选题】
我国植被面临的主要问题有A.
人均森林面积相当于世界人均水平的1/5
B.
由于不合理的利用，森林生态系统呈现衰退的趋势
C.
过度放牧，使草原退化、沙化
D.
森林生态系统中针叶树种过多
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【简答题】3 假设 w 1 (0)=0.2, w2(0)=0.4, θ (0)=0.3, η =0.4 ,请用单层感知器完成逻辑或运算的学习过程。
【简答题】Symptoms of empty nest syndrome can include depression, a sense of loss of purpose, worry, stress, and anxiety over the child’s welfare. →Besides the harm done to the immune system, empty nest syndrom...
【简答题】如图所示是一个正在工作的变压器,它的一次绕组匝数N1=600匝,电压U1=220 V,电路中装有额定电流I0=0.2 A的熔断器,二次绕组匝数N2=120匝。为保证一次绕组电路中的电流不超过I0,则负载功率不能超过( )W,二次绕组电流不超过( )A.(变压器假设是理想的)
【简答题】The common symptoms of Novel coronavirus include respiratory symptoms, fever, cough, shortness of breath and breathing difficulties. In more severe cases, it can lead to pneumonia, kidney failure, and...
【单选题】患儿女,岁,肺炎。今日突然出现烦躁不安、呼吸困难、发绀,呼吸 65 次/分,心率160 次/分,右肺叩诊鼓音,听诊呼吸音减低,肝肋下 2.5 cm, 胸片示纵膈向左移位,护士判断该患儿最可能发生了( )
A.
脓胸
B.
肺不张
C.
心力衰竭
D.
气胸
E.
支气管异物
【简答题】假设在某个地区细胞识别中正常（w 1 ）和异常（w 2 ）两类先验概率分别为P（w 1 ）=0.8，P（w 2 ）=0.2，现有一待识别的细胞，其观察值为x，从类条件概率密度分布曲线上查得P（x/w 1 ）=0.25，P（x/w 2 ）=0.6，并且已知λ 11 =0，λ 12 =6，λ 21 =1，λ 22 =0。请分析两种结果的异同及原因。
【单选题】It can be difficult to know if you are suffering from the common cold, or the flu. Each can cause fatigue and weakness. Symptoms for each can include a stuffy nose, sneezing, sore throat, chest discom...
A.
However, a cold sufferer rarely has a high fever, or headache, nor does a cold suffer experience extreme exhaustion from his malaise
B.
However, both of them can make you feel miserable.
C.
Antiviral medications may be prescribed by your doctor for the flu.
D.
The flu’s complications are more serious than those from a cold, and could even turn out to be life threatening.
【单选题】患儿女,1岁,肺炎。今日突然出现烦躁不安、呼吸困难、发绀,呼吸65次/分,心率160次/分,右肺叩诊鼓音,听诊呼吸音减低,肝肋下2.cm, 胸片示纵膈向左移位,护士判断该患儿最可能发生了( )
A.
脓胸
B.
肺不张
C.
心力衰竭
D.
气胸
E.
支气管异物
【单选题】患儿女,1岁,肺炎。今日突然出现烦躁不安、呼吸困难、发绀,呼吸65次/分,心率160次/分,右肺叩诊鼓音,听诊呼吸音减低,肝肋下5cm,胸片示纵膈向左移位,护士判断该患儿最可能发生了()
A.
脓胸
B.
肺不张
C.
心力衰竭
D.
气胸
E.
支气管异物
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