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【单选题】
在自然界中取得的未经任何改变或转换的能源，原油、天然气、水能、风能、地热等。称之为一次性能源，下列能源中哪种能源属于一次性能源：()A.
原煤
B.
电力
C.
焦炭
D.
煤气
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皮皮学刷刷变学霸
举一反三
【简答题】根据 SiO 2 的含量可将岩浆岩划分为 、 、 和 四种基本岩浆类型。
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【简答题】根据SiO 2 的含量可将岩浆岩划分为（）、（）、中性岩和酸性岩等四种基本岩浆类型。
【简答题】单电子体系,轨道或电子的能量 : E n s ( ) E n p ( ) E n d ( ) E n f 多电子体系,轨道或电子的能量 : E 4s ( ) E 4p ( ) E 4d ( ) E 4f
【单选题】The FE curve has a:
A.
negative slope because an increase in domestic interest rates leads to capital inflows causing a surplus in the official settlements balance. A decrease in output levels is thus needed to reduce that surplus.
B.
positive slope because a decrease in domestic interest rates leads to capital outflows causing a surplus in the official settlements balance. An increase in output levels is thus needed to reduce that surplus.
C.
positive slope because an increase in domestic interest rates leads to capital inflows causing a surplus in the financial account balance. An increase in output levels is thus needed to reduce that surplus.
D.
negative slope because an increase in domestic interest rates leads to capital outflows causing a deficit in the financial account balance. An increase in output levels is thus needed to reduce that deficit.
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