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【单选题】
厄尔尼诺现象范围的扩大，导致全球大范围气候异常的原因是 ( )A.
太阳黑子运动
B.
地球温室效应增强
C.
热带气旋
D.
臭氧空洞导致紫外线增加
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皮皮学刷刷变学霸
举一反三
【单选题】If the effective bearing area has been reduced , remedial action should be taken.
A.
by more than 5 percent
B.
by less than 10 percent
C.
to 95 percent
D.
to less than 90 percent
【单选题】对于结点电压法中的无伴电压源，下列叙述中，（ ）是错误的。
A.
可利用电源等效变换转化为电流源后，再列写结点电压方程
B.
可选择该无伴电压源的负极性端为参考结点，则该无伴电压源正极性端对应的结点电压为已知，可少列一个方程
C.
可添加流过该无伴电压源电流这一新的未知量，只需多列一个该无伴电压源电压与结点电压之间关系的辅助方程即可
D.
无伴受控电压源可先当作独立电压源处理，列写结点电压方程，再添加用结点电压表示控制量的补充方程
【简答题】对于结点电压法中的无伴电压源，下列叙述中，哪个是错误的：A. 可利用电源等效变换转化为电流源后，再列写结点电压方程；B.可选择该无伴电压源的负极性端为参考结点，则该无伴电压源正极性端对应的结点电压为已知，可少列一个方程；C.可添加流过该无伴电压源电流这一新的未知量，只需多列一个该无伴电压源电压与结点电压之间关系的辅助方程即可；D.无伴受控电压源可先当作独立电压源处理，列写结点电压方程，再添加用结点...
【单选题】神经纤维动作电位的峰值接近于
A.
Na﹢与K﹢浓度差
B.
K﹢平衡电位
C.
Na﹢平衡电位
D.
Na﹢平衡电位与K﹢平衡电位之差
E.
Na﹢平衡电位与K﹢平衡电位之和
【简答题】美国政府于 1993 年提出的()计划不仅推动了互联网本身的发展,也促进了对下一代互联网的研究。
【简答题】在 LabVIEW 程序框图中,查找创建数组的方法为“查看 → 函数选板 → → → 创建数组 ”。
【单选题】神经纤维动作电位的峰值接近于
A.
Na + 与 K + 浓度差
B.
Na + 平衡电位
C.
K + 平衡电位
D.
Na + 平衡电位与 K + 平衡电位之差
E.
Na + 平衡电位与 K + 平衡电位之和
【简答题】已经漂白加工的羽毛
【单选题】Which of the following, if true, would most weaken the argument of the critics of the Kyoto Protocol that implementing the protocol would be too costly?
A.
While it is true that the scientific community is not unanimously in agreement that global warming is occurring, more than 95 percent of climatologists at universities and government-funded laboratories in Europe and North America agree that global warmin
B.
Hybrid fuel-cell cars are less expensive to operate than conventional cars because of their much greater fuel efficiency, but it is unlikely that these operational savings will ever be able to cost-justify the much greater initial investment required to p
C.
Nuclear power, although completely flee of carbon emissions and comparable in operating cost to an oil-burning power plant, brings the added back-end cost of disposing of the spent nuclear waste, which is both radioactive and highly toxic.
D.
Although it is unfair in a sense to impose different emissions restrictions on different countries, it is only fair to impose the most restrictive limitations on countries whose advanced economic development will allow them to conform. to the regulations w
E.
One nation that switched the fuel of 35 percent of its power plants from coal to natural gas in order to reduce carbon dioxide emissions found that natural gas, although initially more expensive than coal, dropped in price to a level comparable to that of
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