【单选题】OPEC successfully raised the world price of oil in the 1970s and early 1980s, primarily due to_________.
A.
a reduction in the amount of oil supplied and a world-wide oil embargo
B.
a reduction in the amount of oil supplied and an elastic demand for oil
C.
a world-wide oil embargo and an elastic demand for oil
D.
an inelastic demand for oil and a reduction in the amount of oil supplied
【单选题】下列选项中,不属于现在伊斯兰教传播主体地区的是()。
【判断题】教学目标设计应当建立在教材分析和学情分析之后。
【简答题】In the 1970s, OPEC caused a dramatic increase in the price of oil. What pred it from maintaining this high price through the 1980s?
【单选题】OPEC successfully raised the world price of oil in the 1970s and early 1980s, primarily due to
A.
an inelastic demand for oil and a reduction in the amount of oil supplied.
B.
a reduction in the amount of oil supplied and a world-wide oil embargo.
C.
a world-wide oil embargo and an elastic demand for oil.
D.
a reduction in the amount of oil supplied and an elastic demand for oil.
【单选题】均匀磁场B被限制在半径R=10cm的无限长圆柱空间内,方向垂直纸面向里。取一固定的等腰梯形回路abcda,梯形所在平面的法向与圆柱空间的轴平行,位置如图所示。设磁场以dB/dt=1T/s的匀速率增加,已知θ=π/3,oa=ob=6cm,od=18cm。等腰梯形回路中感生电动势的大小为[ ]。【图片】
【判断题】直流电机电刷两端引出的电枢电动势是交变的。