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问题 选择题

三个数70.3，0.37，ln0.3，的大小关系是（　　）

A．70.3＞0.37＞ln0.3

B．70.3＞ln0.3＞0.37

C．0.37＞70.3＞ln0.3

D．ln0.3＞70.3＞0.37

答案

由题，70.3＞1，0.37∈（0，1），ln0.3＜0

三者大小关系为70.3＞0.37＞ln0.3

故选A

改错题

Xiaoming is used to send a lot of cards to his friends       1.     

at new year time. And all his classmates did same. But      2.    

on one day he read a report in the newspaper, which said     3.     

that cards are made of trees. A large number of cards would    4.     

consume a lot of trees but at present more and more trees have     5.   

been cut down lead to serious floods in some areas. Xiaoming   6.     

felt shocked at the report in the newspaper and realized the    7.     

important of protecting trees, and then he shared this report    8.   

with their classmates. From now on he decides to send his     9.   

wishes to his friends by telephone instead sending cards.      10.           
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单项选择题 A3/A4型题

超声波清洗机操作使用中应注意。清洗完成后自动停机，应间隔一段时间才能再次启动，其原因是（）。

A.更换清洗液

B.换能器降温

C.电源变压器降温

D.整流电路检修

E.清洗清洗槽
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