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问题 选择题
下列是勾股数的一组是（   ）

A.4，5，6
B.5，7，12
C.12，13，15
D.21，28，35
答案

答案：D

选择题

1L溶液中含有0.1 mol KCl 和 0.1mol AlCl3,该溶液中c(Cl-)为

A．0.4 mol ·L-1

B．0.3 mol ·L-1

C．0.2 mol ·L-1

D．0.1 mol ·L-1
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Questions


·You will hear five conversations taking place in restaurants and the customers are complaining about something.
·Before you listen, read the list of statements, five of which are summaries of how these problems are solved.
·Then listen carefully and match the statements (A-F) with the conversations that are about them respectively.
·There is one extra statement that you don’t need to use. You will hear the passage twice.
A. it is suggested that she change her order to some sirloin because it is tender.
B. She is asked to send in the bill if she likes to have it cleaned.
C. The head waiter goes to fetch some clean ones immediately.
D. He offers to sponge it with a little warm water.
E. He is advised to choose another wine instead.
F. The head waiter will deal with it himself.

Questions


·You will hear five conversations taking place in restaurants and the customers are complaining about something.
·Before you listen, read the list of statements, five of which are summaries of how these problems are solved.
·Then listen carefully and match the statements (A-F) with the conversations that are about them respectively.
·There is one extra statement that you don’t need to use. You will hear the passage twice.
A. it is suggested that she change her order to some sirloin because it is tender.
B. She is asked to send in the bill if she likes to have it cleaned.
C. The head waiter goes to fetch some clean ones immediately.
D. He offers to sponge it with a little warm water.
E. He is advised to choose another wine instead.
F. The head waiter will deal with it himself.
查看答案