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问题
填空题
机车信号测试环线电流模拟量应满足机车信号设备所需要的()的需要。
答案
参考答案:最小钢轨短路电流
选择题
— When and where to have the picnic ______.
— Let's make it now.
A. isn't decided
B. has decided
C. doesn't decide
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填空题
煤污病类病原是子囊菌亚门中的()和()。
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