搜题请搜索小程序“爱下问搜题”
问题 选择题

Could you tell me ______? [ ]

A．What's his trouble

B．What his trouble was

C．What was wrong with him

D．What's wrong with him

答案

答案：D

补全对话，情景问答
看一看，写句子。

 

A. What size?
B. How much is it?
C. Thank you.
D. Can I help you? 
E. Is it all right?
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单项选择题

某人购买了一台电压表，刻度为0～10V，使用说明书中给出它的最大允许误差为±0.2%。在×10一档下使用，最大示值误差出现在80V处，其相对误差为-0.15%。为了保证其正确使用，对该电压表的计量特性分析如下：

使用该电压表进行测量时，它所引入的相对标准不确定度为( )。

A．-0.12%

B．-0.086%

C．0.086%

D．0.12%
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