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2010年2月27日，智利发生里氏8.8级特大地震．灾区饮水安全成为人们关注的重要问题．饮用水可由原水经过如下的净化步骤得到： （1）能消毒杀菌的步骤是______（填序号）； （2）这样得到的净水中仍然含有较多的可溶性Ca 2+ 和Mg 2+ ，称为______，在家中，可通过______（填操作方法名称）使Ca 2+ 和Mg 2+ 的浓度降低．但用这种方法，会形成水垢，其主要成分是CaCO 3 和Mg（OH） 2 ，可用稀盐酸将其除去，写出反应的化学方程式______（任写一个）．
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硅
B.
锗
C.
金
D.
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A.
付款信用证    
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承兑信用证
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光票信用证    
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保兑信用证
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were writing; left
B.
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C.
had written; left
D.
were writing; had left
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【单选题】If she dials the wrong number, what should Xiaoli say?
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B.
Oh, I will call back later.
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【单选题】Why is Ms. Ross sending an e-mail?
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【判断题】( )对应付账款应采用询证核对法进行清查。
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【判断题】国内信用证(简称信用证)是适用于国内贸易的一种支付结算方式,是开证银行依照申请人(购货方)的申请向受益人(销货方)开出的有一定金额、在一定期限内凭信用证规定的单据支付款项的书面承诺。( )
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【单选题】The students busily when Miss Brown went to get the book she in the office.
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B.
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C.
had written; left
D.
were writing; had left
查看完整题目与答案
【单选题】If she dials the wrong number, what should Xiaoli say?
A.
Oh, I'm so sorry. I've got the wrong number.
B.
Oh, I will call back later.
C.
Who are you?
D.
What can I do for you?
查看完整题目与答案
【单选题】If she dials the wrong number, what should Xiaoli say?
A.
Oh, I'm so sorry. I've got the wrong number.
B.
Oh, I will call back later.
查看完整题目与答案
【单选题】If she dials the wrong number, what should Xiaoli say?(微课7)
A.
Oh, I'm so sorry. I've got the wrong number.
B.
Oh, I will call back later.
查看完整题目与答案
【单选题】Why is Ms. Ross sending an e-mail?
A.
She received defective products.
B.
The store sent a wrong item.
C.
The bill was charged incorrectly.
D.
The delivery arrived too late.
查看完整题目与答案
【简答题】A．She is afraid. B．She is unable to dance. C．She is not free tonight. D．Something was wrong with her leg.
查看完整题目与答案