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问题
填空题
立式烟管锅炉对燃煤要求较高,一般都使用发热量()千卡/千克的煤种。
答案
参考答案:
5000
选择题
She always finishes her homework on time. She _____ leaves it for tomorrow.
A. always
B. never
C. usually
D. sometimes
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判断题
交、直流配电设备的机壳应单独从接地汇集线上引入保护接地。
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