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在超视距作战中，探测装置是探测战斗机的最有效方法。 A.
雷达 B.
红外 C.
声学 D.
光学

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Which of the following is NOT true about the Sydney Opera House？ A.
It is one of the most recognizable opera houses in the world. B.
It was made a UNESCO World Heritage Site in 2007. C.
It is a modern expressionist design of the 20th century. D.
It is well-known for its acoustics and stage equipment.

单项选择题

‎对于由下列反应构成的原电池来说，欲使其电动势增加，可采取的措施有：‏

A．增大银离子的浓度
B．降低银离子的浓度
C．加大锌电极
D．增大锌离子的浓度