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【简答题】
港口有几种分类方法？如何分类的？
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反馈参考答案：
举一反三
【单选题】When airlines cancel the flight and cause the refund, ________.refund will be collected by the airlines according to their tariffs
A.
the cancellation fee must be charged
B.
the
C.
refund can be made without any service charge
D.
unless the refund reason is clearly stated
【多选题】在元素周期表中前四周期的五种元素的位置关系如图所示,若 B 元素的核电荷数为 Z ,则五种元素的核电荷数之和可能为( )
A.
5Z
B.
5Z ＋ 18
C.
5Z ＋ 10
D.
5Z ＋ 8
【单选题】--____________ --Receipt, tax refund form and your passport.
A.
What do I need for the tax refund at the airport？
B.
Where could I get my tax refund?
C.
Can I get a tax refund for this?
【简答题】如图所示是前四周期的五种元素在周期表中的相对位置关系．乙和丁的原子序数之和为甲的4倍，则 （1）用电子式表示丁的气态氢化物的形成过程为：______； （2）乙、丁按原子个数比1：3组成的化合物电子式为（各原子最外层均达到8e - 稳定结构）______； （3）丙的气态氢化物的结构式为______； （4）戊的原子序数为______；在元素周期表中的位置为第______周期______族； （5...
【单选题】After the adventure, the children returned home, ______.
A.
safe but tired
B.
safely but tiredly
C.
safely but tired
D.
safe but tiredly
【多选题】If you want to get the tax refund, what to show at the Customs?
A.
passport
B.
tax refund form
C.
goods
【简答题】The parents who want to keep contact with their children by cell phone have a deep concern for the children's______.
【简答题】A．offer B．provide C．replace D．refund
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