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【单选题】
SiF 4 的空间构型为 ( ) 。A.
四方锥
B.
平面四边形
C.
正四面体
D.
菱形四面体
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【简答题】If we guarantee an annual order of a certain amount, would you give us a special discount?
【简答题】She promised her brother that she______ (write) to him.
【判断题】Although Postscript is an afterthought and a sign of poor planning, we reserve the use of PS for information that we want to give very special emphasis.
A.
正确
B.
错误
【简答题】_____ orders _____ 500 pieces or more, we give a special discount ____ 2%.
【单选题】Proofread the following sentences. Identify the parts which are incorrect, and write down A,B,or C on the short lines below. On receiving orders for 12 pallets or much , we will give a special discoun...
A.
on
B.
or much
C.
of
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