中国大学MOOC: $string=A;$string=$string x 4;$string.=B;$string.=A;$find_B=index($string,B);执行以上语句后，$find_B=？

$string="A";$string=$string x 4;$string.="B";$string.="A";$find_B=index($string,"B");执行以上语句后，$find_B=？ A: 4 B: 3 C: 2 D: 1

The double quotes in "Good Morning!" are part of the string.

‏In the oracle bone inscriptions, "yu" (jade) is a _____ character that looks like three pieces of jade threaded on a string. ​

c#的引用类型包括类、接口、数组、委托、object和string.其中object（）根类。 A: A只是引用类型的 B: B只是值类型的 C: C只是string类型的 D: D是所有值类型和引用类型的

In a ( ), the oscillations are perpendicular to the direction in which the wave travels. An example is a wave on a string. A: transverse wave B: longitudinal wave

中国大学MOOC: In the oracle bone inscriptions, yu (jade) is a _____ character that looks like three pieces of jade threaded on a string.

下列语句均为类定义成员变量定义，其中合法的语句是（ ）。 A: string _string; B: string @string; C: string string; D: string _;

声明一个有3个元素的String类型的数组，不正确的是 A: String[] str = new String[3]; B: String str[] = new String[3]; C: String [] str = new String[3]; D: String[3] str = new String();

主方法的参数类型是 A: String[] B: String C: string[] D: string