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搜题
【单选题】
一个完整的计算机系统应该包括A.
主机、键盘和显示器
B.
硬件系统和软件系统
C.
系统软件和应用软件
D.
主机和它的外部设备
手机使用
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新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】Who volunteered to clean up the oil
A.
Business people, storekeepers and students
B.
Storekeepers, reporters and business people
C.
Farmers, scientists and teachers
【简答题】innovation
【单选题】Who volunteered to clean up the oil?
A.
Businessmen, storekeepers, students and others.
B.
Storekeepers, reporters, businessmen, and others.
C.
Farmers, scientists, teachers and others.
D.
Scientists, technicians, businessmen and others.
【单选题】— The floor is clean and dry now. Who _______? — Sorry, I don’t know.
A.
mopped it up
B.
has mopped it up
C.
has mopped up it
D.
mopped up it
【单选题】Your bedroom is very dirty. You must _____. [ ]
A.
clean up it
B.
clean it up
C.
clean them up
D.
clean up them
【单选题】已知某单能射线在钢中的半价层为3mm,则该射线在钢中的吸收系数为( )。
A.
0.231cm
B.
2.31cm-1
C.
2.079cm
D.
0.00231mm-1
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