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【多选题】
下列说法中正确的是 [ ]A.
因为p轨道是“8”字形的，所以p电子走“8”字形
B.
在M层中，有3s、3p、3d、3f四个轨道
C.
氢原子光谱是线状光谱
D.
原子轨道与电子云都是用来形象描述电子运动状态的
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举一反三
【单选题】Producers and exporters know that foreign markets will______to them.
A.
remain opening
B.
remain opened
C.
remain open
D.
remain openness
【单选题】18 Countries sometimes fear that foreign producers are pricing their exports artificially low. This fear is most likely based on the assumption that ________.
A.
foreign companies will lack the earnings to repay their foreign debt
B.
insufficient earnings will be available to improve product technology
C.
foreign producers will charge exorbitant prices after putting competitors out of business
D.
developing countries will be unable to maintain critical industries needed in times of war
【单选题】Foreign producers typically agree to voluntary export restrictions because:
A.
their manufacturing capacity is limited.
B.
they can divert their exports to other countries and charge more for their products.
C.
they fear far more damaging punitive tariffs or import quotas might follow if they do not.
D.
they are required to by the World Trade Organization.
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