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未完成事件

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孕妇预防胎膜早破的方法是（）

A. 预防性使用抗生素
B. 提前行剖宫术
C. 积极预防和治疗下生殖道感染
D. 卧床休息
E. 阴道检查

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从字的结构方式看，“芹”是（）

A. 象形字
B. 指事字
C. 会意字
D. 形声字

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煤尘的爆炸危险性与其所含挥发分无关.

A. 正确
B. 错误

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public class X implements Runnable { private int x； private int y； public static void main（String [] args） { X that = new X（）；（new Thread（ that ））.start（）；（new Thread（ that ））.start（）； } public void run（） { for （；；） { synchronized （this） { x++； y++； } System.out.println（Thread.currentThread（）.getName（） + “x = “ + x + “， y = “ + y）； } } } What is the result？（）

A. Compilation fails.
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 only once （for example， “x = 1， y = 1” followed by “x = 2， y = 2”）. The thread name at the start of the line shows that both threads are executing concurrently.
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 once （for example， “x = 1， y = 1” followed by “x = 2， y = 2”）. The thread name at the start of the line shows that only a single thread is actually executing.

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