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【单选题】
四种短周期元素W、X、Y、Z的原子序数依次增大，其原子的最外层电子数之和为19，W和X元素原子内质子数之比为1：2，X 2+ 和Z — 离子的电子数之差为8。下列说法不正确的是A.
与W想邻的同主族元素可制成重要的半导体材料
B.
元素原子半径从大到小的顺序是X、Y、Z
C.
W、Y、Z元素最高价氧化物对应的水化物中酸性最强的是H 2 YO 4
D.
X的单质在W的最高价氧化物中的燃烧反应属于置换反应
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【简答题】图样中的图形只能表达零件的 ,零件的真实大小应以图样上所注的 为依据。
【单选题】When a country takes a multilateral approach to free trade, it
A.
removes trade restrictions on its own.
B.
reduces its trade restrictions while other countries do the same.
C.
does not remove trade restrictions no matter what other countries do.
D.
is willing to trade with multiple countries at once.
【单选题】The audience sits in a circle and the performance ________ in the centre.
A.
takes place
B.
is taken place
C.
holds
D.
is happened
【单选题】When trade takes place:
A.
both parties will probably be worse off.
B.
one party must gain at the other party's expense.
C.
both parties can be better off.
D.
one party will gain and the other party will be neither better nor worse off.
【单选题】When a country takes a unilateral approach to free trade, it
A.
removes trade restrictions on its own.
B.
reduces its trade restrictions while other countries do the same.
C.
does not remove trade restrictions no matter what other countries do.
D.
is willing to trade with multiple countries at once.
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