题目

某导体两端的电压为6伏，20秒内通过它横截面的电荷量为2库，通过的电流为____________安，电流所做的功为____________焦；若该导体两端的电压降为3伏时，它的电阻为____________欧。 答案：0.1；12；60解析:略 Dear Sally， Please take some things to school for your brother，Sam．He needs them for an English class（课）．He needs his English book，video，English-English dictionary，CD，and notebook．The English book is under the chair．The video is on the table．The dictionary is on the bookcase．The CD is under the desk．The notebook is on the bed． Thanks， Mom 请根据短文内容，判断下列句子正（T）误（F）。 1．Sally and Sam are sister and brother． 2．Sally needs some things for class． 3．Sally Will（将）take five things to school． 4．Sam's dictionary is an English-Chinese（英汉的）one． 5．The dictionary is on the CD．