题目内容

某RTU有光纤和微波(模拟量通道)二个远动通道,如果有一个通道是正常的,则说明RTU没有问题。

A. 正确
B. 错误

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特别重要的大型施工机械(如大型起重机械、运输车辆、土石方机械等),在机械购置选型如有必要应送到专门的检测检验机构检验。

A. 正确
B. 错误

教育科学理论的研究特点在于()与()。

盾构机主要由()、推土机构、管片拼装机、双室气阀、后配套装置、电气系统及辅助设备组成。

A. 管片运输机
B. 盾体
C. 刀盘驱动
D. 配电柜

1. import java.util.*; 2. public class TestSet { 3. enum Example { ONE, TWO, THREE } 4. public static void main(String[] args) { 5. Collection coll = new ArrayList(); 6. coll.add(Example.THREE); 7. coll.add(Example.THREE); 8. coll.add(Example.THREE); 9. coll.add(Example.TWO); 10. coll.add(Example.TWO); 11. coll.add(Example.ONE); 12. Set set = new HashSet(coll); 13. } 14. } Which statement is true about the set variable on line 12?()

A. The set variable contains all six elements from the coll collection, and the order is guaranteed to be preserved.
B. The set variable contains only three elements from the coll collection, and the order is guaranteed to be preserved.
C. The set variable contains all six elements from the coil collection, but the order is NOT guaranteed to be preserved.
D. The set variable contains only three elements from the coil collection, but the order is NOT guaranteed to be preserved.

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