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【简答题】
Why is the South Pole cold than the North Pole? S1.______ Both polar regions of the earth are cold, primarily because they receive far less solar radiation than the tropics and mid-latitudes do. In either pole the sun S2.______ never rises more than 23.5 degrees above the horizon and both locations experience six months of continuous dark. Moreover, most of the sunlight that does shine S3.______ on the polar regions reflected by the bright white surface. S4.______ What make the South Pole so much colder than the North Pole S5.______ is that it sits on top of a very thick ice sheet, which itself sits on a continent. Surface of the ice sheet at the South Pole S6.______ is more than 9000 feet in elevation—more than a mile and a half over sea level. Antarctica is the highest continent S7.______ on the earth. In comparison, the North Pole rests in the middle of the Arctic Ocean, which the surface of floating ice rides S8.______ only a foot or so above the surrounding sea. The Arctic Ocean also acts an effective heat reservoir, warming the cold atmosphere S9.______ in the winter and is drawing heat from the atmosphere in the summer. S10.______ 【S1】
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【简答题】常用钢种代号g的含义是:( )。
【判断题】缺点列举法从发现问题,即发现产品的缺点入手,然后利用各种技术加以改变,从而创造出新的产品。
A.
正确
B.
错误
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A.
22
B.
4
C.
0
D.
100
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A.
1,1
B.
1,1.0
C.
1.0,1
D.
1.0,1.0
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A.
磁导率越大
B.
电阻率越大
C.
磁导率越小
D.
电阻率越小
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【单选题】食品安全中常用的GRAS指:
A.
天然的
B.
有轻微毒害的
C.
化工合成但可以安全使用的
D.
公认为安全的
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A.
333
B.
334
C.
234
D.
233
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