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【单选题】
下列关于溶液说法正确的是（ ）A.
溶液一定是无色透明的
B.
溶质一定是固体
C.
饱和溶液一定是浓溶液
D.
不饱和溶液变成饱和溶液，其溶质质量百分比浓度不一定增大
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【单选题】We have become so used to defending ourselves against the new atmosphere of American life, so used to putting ________ barriers, that we have not had time to think about what it may mean.
A.
forward
B.
forth
C.
up
D.
down
【简答题】For that is what has happened. We have become so used to defending ourselves against the new atmosphere of American life, so used to ___(17)___, that we have not had time to think about what it may me...
【单选题】系统测试是将软件系统与硬件、外设和网络等其他因素结合，对整个软件系统进行测试。(12)不是系统测试的内容。
A.
路径测试
B.
可靠性测试
C.
安装测试
D.
安全测试
【单选题】系统测试是将软件系统与硬件、外设和网络等其他因素结合，对整个软件系统进行测试。(4)不是系统测试的内容。
A.
路径测试
B.
可靠性测试
C.
安装测试
D.
安全测试
【简答题】We have become so used to defending ourselves against the new atmosphere of American life, so used to putting up b_______(障碍) , that we have not had time to think about what it may mean.
【简答题】感性电路中,ψ( )0,Q( );容性电路中,ψ( )0,Q( )0。
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