【简答题】小明利用如图甲所示电路测定小灯泡的功率.被测小灯泡的额定电压为 2.5V,电阻约为10Ω左右.实验室有如下器材:电源(电压为6V)、电流表(0~0.6A 0~3A)、电压表(0~3V 0~15V)、开关各一个、导线若干、滑动变阻器三只:R1(20Ω 0.5A)、R2(50Ω 0.5A)、R3(500Ω 1A). ( 1)实验前在检查仪器时,发现电流表指针如图乙所示,则接下来的操作是 ....
【单选题】Where is your mother ?
C.
She’s behind the door.
【简答题】Mr Jones and Mr Brown work in the same office (办公室).One day Mr Jones says to Mr Brown , “I will have a small party at our house on Monday evening . Would you and your wife like to come ?” Mr Brown say...
【简答题】Dave:Emma, is this a photo of your family? Emma:Yes, it 36 . Dave:Is the old man(老人) 37 grandfather? Emma: 38 , he is. Dave:And who is the man(男人)? Emma:Oh, he is his 39 , Nick. Dave:So Nick is your f...
【判断题】测量电路 的功率 时, 功率表的 电压 线圈 、电流 线圈 都要 并 联在电路中。
【简答题】Task 2 Amy is complaining to a salesman about a computer she bought. Listen to the conversation and fill in the blanks with what you hear. S: Good morning, madam. Can I help you? A: Well, it’s abo...
【单选题】一Is your sister a worker or a doctor? — ________.
【简答题】1 Same or different? Write S or D. ► He phoned/rang his sister. S 1 What’s your phone/mobile number? ____ 2 ... two six oh/zero four ... ____ 3 I left/took a message. ____ 4 I’m ...
【简答题】例:对某异步电机进行短路试验, W A-AB 的测量接线如图所示(图中未示出 W C-CB 、 I C 等的测量接线)。所用仪器仪表规格、仪表读数及相应的修正值见后。求 W A-AB 的功率。 所用仪器仪表的规格如下: 功率表: 0.5 级,满度 150 格,电压线圈 600V ,内阻 20000Ω ,电流线圈 5A , cosφ=0.2 低功率因数表,满刻度 600W ; 电压表: 0.5 级,...
【简答题】Do you feel lonely when your best friend isn’t around? Here’s our advice to you-- and to all kids who feel lonely sometimes. It’ s hard when a best friend isn’t around—maybe because he or she moved to...