【单选题】— Excuse me. Where do koalas come from? — Oh, they come from ________. [ ]
【简答题】根据汉语提示完成句子: ____(哪里)do they come from? ____(be)they from Greece? No, they're not come from Greece. They come from Italy.
【单选题】一Where do ______ come from? —They come from Australia. [ ]
【多选题】一台 50HZ 、变比为 11 的单相变压器,若低压侧接入电压为 10kV 的交流电,则在高压侧可得到频率为( )、电压为( )的交流电;若低压侧接在直流电源上,则在高压侧得到( )的电压
【单选题】一台单相变压器,额定电压为220V/110V,现将高压侧接在电压为250V的电源上,变压器等效电路中的励磁电抗( )
【单选题】神经元细胞外液中 K + 浓度升高,静息电位的绝对值将()
【单选题】—Where do _____ come from? —They come from Australia. [ ]
【单选题】—Excuse me. Where do koalas come from? —Oh, they come from _________. [ ]
【单选题】一台 50HZ 、变比为 11 的单相变压器, 若低压侧接在100V的直流电源上,则在高压侧得到( )的电压