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【单选题】
为什么美队的M1A1主坦克总是能最先发现对手？也就是先发制人打击的坦克？因为该坦克装备的掺钕钇铝石榴石（ ），在晴朗的白天可以达到近4000米的观瞄距离。
A.
稀土荧光材料
B.
激光测距机
C.
稀土强化的镁钛合金
D.
长余辉材料
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】听力原文： In an apparent attempt to force direct dialogue with the United States, North Korea threatened on Tuesday to abandon the armistice that ended the Korean War five decades ago, accusing Washington...
A.
intended to have direct negotiations with the U. S.
B.
prepared for the American preemptive attack
C.
wanted to take a decisive step for many years
D.
thought it possible the armistice would bind them