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【单选题】
下列分子中 ， 中心原子采取不等性 sp 3 杂化的是A.
BF 3
B.
BCl 3
C.
H 2 O
D.
SiCl 4
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举一反三
【简答题】https://www.ixigua.com/i6792384172783586575/ Q1: How much did the woman get for the tip? A。 a quarter B. some coins C. more than a quarter Q2: How would the man do when the waitress complained?...
【简答题】晶体三极管有三种基本的工作状态,当其发射结 ,集电结 时,工作在放大区;当发射结正偏,集电结 时,工作在饱和区;当发射结反偏,集电结 时,工作在截止区。
【单选题】People who dine in a New York restaurant
A.
are not expected to give any tip to the waiter or waitress.
B.
had better tip more than 15% so as not to be shamed.
C.
may be looked down upon when offering a considerable tip.
D.
are thought of as generous if they tip 15%.
【单选题】The waitress says that many customers like __________.
A.
Beijing roast duck
B.
their house special
C.
sweet and sour fish
D.
o
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