JavaScript中，var order1 = 1 + (2 + "3")；<br/>var order2 = "1" + (2 + 3)；order1和order2的值分别是 A: “123”和 “15” B: “6”和 “15” C: “6”和 “6” D: “123”和 “123”

MATLAB将函数f(x)在x=1处展开为5次多项式,所使用的指令是( )。 A: tailor(f,x,1,'order',6) B: tayler(f,x,1,'order',5) C: diff(f,x,1,'order',5) D: taylor(f,x,1,'order',6)

There are following business statements for an information system:①A customer submit 0 or more orders;②An order can only be submitted by one customer. There are two classes in the system “Customer” and “Order”. For each instance of Order Class, there are ____ instance(s) of Customer Class; while for each instance of Customer Class, there are ____ instance(s) of Order Class. A: (1) 1 (2) 1 B: (1) 1 (2) 1 or more C: (1) 1 (2) 0 or more D: (1) 0 or more (2) 1

哪种方式通过对比页面变化能判断 sql 注入（）。 A: order 1 和 order 2 B: ' or 1=1 和' or 1=2 C: '和'' D: ' and 1=1 和' and 1=2

The number of subgroups of order 25 of an Abelian group of order 50 is ( ). A: 0 B: 1 C: 2 D: 3

请选择下面正确的SQL语句( ) A: select * from 表名 order by 列名1 and order by 列名2 B: select * from 表名 order by 列名1,列名2 C: select * from 表名 where 列1=值1 and 列2=值2 D: select * from 表名 where 列1=值1 and 列1=值2

ORDER BY 子句可包括多个排序列，ORDER BY '排序列1' [ASC, DESC], '排序列2' [ASC, DESC

Number these events in chronological order from 1 (the first to happen) to 6 (the most recent).

下列（ ）赋值语句是错误的 A: Select @c=1 B: Set @c=1 C: Select @dj=单价 from book order by 单价 desc D: Set @dj=单价 from book order by 单价 desc

In order to reduce feed waste, the thickness of the feed should not exceed the trough ( ). A: 1/3 B: 1/2 C: 2/3 D: 1/4