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【单选题】
下列软件中()一定是系统软件.A.
自编的一个C程序,功能是求解一个一元二次
B.
WINDOWS操作系统
C.
用汇编语言编写的一个练习程序
D.
存储有计算机基本输入输出系统的ROM芯片
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举一反三
【单选题】We _____ in the city, but now we live in the countryside
A.
used to live
B.
used to living
C.
were used to live
D.
were used to living
【单选题】When the author says that we need to be in the driver's seat, he means that .
A.
a. we need to drive a car
B.
b. we should control our driving
C.
c. we must change the world
D.
d. we should govern our thinking
【简答题】()是跟踪或追踪命令。
【单选题】_________ for over 50 years, we are confident we can give our customers complete satisfaction.
A.
Being in business
B.
Having been in business
C.
In business
D.
We are in business
【单选题】下列说法正确的是（ ）
A.
将某电解质溶液加水稀释，溶液中离子浓度都减小
B.
将AlCl 3 溶液、Na 2 SO 3 溶液蒸干并灼烧分别得到Al 2 O 3 、Na 2 SO 3
C.
0.1mol/LCH 3 COOH溶液在稀释过程中c（H + ）/c（CH 3 COOH）将变大
D.
25℃时，pH=3的某酸溶液与pH=11的NaOH溶液等体积混合后，溶液的pH≥7
【单选题】___ have to work today, we should go to Laguna Beach.
A.
For we do not
B.
We do not
C.
Since we do not
D.
Since we do no
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