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题型:单项选择题 Хотя эта схема не общепризнана, но,______, достаточно популярна.A.безнадёжно B.безобидно C.безусловно 查看答案
题型:单项选择题 有一面积S=100cm2的金属环,电阻为R=0.1Ω,环中磁场变化规律如图所示,且磁场方向垂直环面向里,在t1到t2时间内,环中感应电流的方向如何?通过金属环的电荷量为多少? 查看答案
题型:单项选择题 用 come about, happen, take place, break out, occur 的正确形式填空.① I was out of town at the time, .so I don't know exactly how it _________ . ②The meeting _________ at 8:00 as planned. ③It ________ to rain that morning. ④A fire ________ in the hotel last night. ⑤It suddenly ________ to me that I had left my key in the office. 查看答案