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【判断题】
操作系统是用户和计算机的接口,如果没有操作系统,计算机将无法使用。A.
正确
B.
错误
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参考解析：
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皮皮学刷刷变学霸
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【简答题】隔离开关存有严重家族性缺陷尚未整改，应被评价为（）。
【单选题】铺备用床(被套式)操作中以下错误的一项是
A.
移开床旁桌距床约20CM
B.
座椅放在床尾正中，按顺序放上用物
C.
双手掌心向下将大单平铺于床垫下
D.
棉被两边与床沿平齐，尾端塞于床垫下
E.
套上枕套，开口处背门放置
【简答题】Dear sirs, We thank you for your ___1___ of 22 November. Under ___2___, you will find a ___3___ giving detailed information about our “Flying Tiger” Brand motor-boats, ___4___ the good results we have...
【单选题】阅读以下程序,则y=( )。 x=[4,-9,25]; if x<0 disp('some of the elements of x are negative.') else y=sqrt(x) end
A.
2.0000+0.0000i 0.0000+3.0000i 5.0000+0.0000i
B.
2.0000 3.0000 5.0000
C.
2.0000-1.0000i 3.0000 5.0000
D.
2.0000 3.0000 5.0000i
【单选题】在下列的SQL语句中，属于数据操作语句的是( )。 Ⅰ．CREATE Ⅱ．SELECT Ⅲ．UPDATE Ⅳ．GRANT Ⅴ．DROP Ⅵ．DELETE Ⅶ．ALTER Ⅷ．INSERT Ⅸ．REVOKE
A.
Ⅰ、Ⅴ、Ⅵ、Ⅶ
B.
Ⅳ、Ⅸ
C.
Ⅲ、Ⅵ、Ⅷ
D.
Ⅰ、Ⅴ、Ⅶ
【单选题】听力原文： The private motor vehicle has given us a our ancestors could not dream about. We can travel swiftly, and usually safely, over the roads which have been built to accommodate our cars. Peo...
A.
The sadness of being involved in accidents.
B.
Ways to limit the use of private cars.
C.
The serious pollution on motor roads.
D.
to travel quickly and safely.
【单选题】阅读以下程序,则 (15分) x=[4,-9,25]; >> if x>=0 y=sqrt(x) else disp('some of the elements of x are negative.') end
A.
B.
C.
some of the elements of x are negative
【单选题】阅读以下程序,则y=( )。 x=[4,-9,25]; if x>=0 y=sqrt(x ) else disp('some of the elements of x are negative.') end
A.
2.0000 3.0000i 5.0000
B.
2.0000 3.0000 5.0000
C.
some of the elements of x are negative.
D.
2.0000 3.0000 5.0000i
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