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接地封线应装设在什么位置?

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public class X implements Runnable( private int x; private int y; public static void main(Stringargs) X that = new X(); (new Thread(that)).start(); (new Thread(that)).start(); ) public void run() ( for (;;) ( x++; y++; System.out.printIn(“x=” + x + “, y = ” + y); ) ) What is the result?()

A. Errors at lines 7 and 8 cause compilation to fail.
B. The program prints pairs of values for x and y that might not always be the same on the same line (for example, “x=2, y=1”).
C. The program prints pairs of values for x and y that are always the same on the same line (for example, “x=1, y=1”. In addition, each value appears twice (for example, “x=1, y=1” followed by “x=1, y=1”).
D. The program prints pairs of values for x and y that are always the same on the same line (for example, “x=1, y=1”. In addition, each value appears only for once (for example, “x=1, y=1” followed by “x=2, y=2”).

番茄出现脐腐病的原因是缺钙。

A. 正确
B. 错误

追本溯源,网络广告产生于()。

A. 美国
B. 英国
C. 法国
D. 中国

产业市场细分中常用的依据是()。

A. 社会、经济
B. 心理
C. 生活方式
D. 行业类型

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