下列哪个消息用于控制器指导交换机的转发行为？ A: OFPT_PACKET_IN B: OFPT_PACKET_OUT C: OFPT_HELLO D: OFPT_FEATURES_REQUEST

语句Print Format("HELLO", " A、HELLO: HELLO|He|he|hello

​若字符串 s = 'hello world'，则语句 s.ljust(15, '.') 和 s.rjust(15) 的输出结果为？​ A: '....hello world'' hello world' B: 'hello world....'' hello world' C: 'hello world....''hello world ' D: 'hello world....''hello world'

编写一个Python程序，输出如下语句 Hello Python Hello Python Hello Python Hello Python Hello Python

以下程序运行后的输出结果是x="hello "print(x*3) A: hello*3 B: hello hello hello C: hello D: hellohellohello

下面代码的运行结果是（ ）。var str= "hello world" ;var str1=str.toUpperCase();var str2=str.toLowerCase() ;alert (str1) ;alert (str2) ; A: "HELLO WORLD","HELLO WORLD" B: "HELLO WORLD","hello world" C: "hello worl","HELLO WORLD" D: "hello world","hello world"

下列嵌套关系正确的是 A: hello B: hello C: hello D: hello

下列一段Python代码的运行结果是count = 2while count > 0: print('hello') count = count - 1 breakprint('over') A: hello hello over B: hello over hello over C: hello over D: hello hello over over

print(print('Hello'))，输出为（ ）。 A: Hello None B: Hello C: None D: Hello None

如何使用 PHP 输出 "hello world"？( ) A: "Hello World"; B: echo "Hello World"; C: Document.Write("Hello World"); D: console.log("Hello World");