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【单选题】
关于尺寸公差 , 下列说法中正确的是( )A.
尺寸公差只能大于零故公差值前只能标 “+” 号
B.
尺寸公差是用绝对值定义的，没有正负的含义 , 故公差值前不 “+” 号
C.
尺寸公差不能为负值，但可为零值
D.
尺寸公差必须为正数值
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皮皮学刷刷变学霸
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【简答题】Listen again and complete the following conversation with what you hear. You're the next to __________. Are you ready? I know, but now I can't __________ and my mouth feels dry. Why don't you believe ...
【单选题】You don't believe it ? You know I ____ the truth.
A.
tell
B.
told
C.
am telling
D.
had told
【简答题】A．I have something to tell you. B．I don't always believe it. C．The Internet is very useful. D．It is important news.
【单选题】You don't believe it? Go and see________ ．
A.
for yourself
B.
of yourself
C.
on yourself
D.
with yourself
【简答题】Why don't you believe you can do it? _____________ and you will feel fine.
【单选题】I don't believe you can do it youself,_______ ?
A.
can you
B.
do I
C.
don't I
D.
can't you
【简答题】_________是当输入正弦信号的频率改变时,输出、输入正弦信号的振幅之比随频率的变化
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