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【单选题】
石膏的性味（ ）A.
、甘，大寒
B.
苦、，大寒
C.
苦、甘，寒
D.
苦、，寒
E.
、甘，凉
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【单选题】如图所示,将标有“12V 6W”的灯泡L和“6V 6W”的灯泡L 2 并联后,接在6V的电源上(设灯丝电阻不变),则( )
A.
灯泡L 1 比灯泡L 2 亮
B.
灯泡L 2 比灯泡L 1 亮
C.
两灯的实际功率之和大于12W
D.
两灯的实际功率之和等于12W
【多选题】如图所示的电路中,小灯泡L 1 和L 2 连在电路里,电源由两节干电池串联而成,则下列说法不正确的是( )
A.
L 1 、L 2 并联，闭合开关S时两灯都亮
B.
S闭合后，电路将发生短路
C.
要使 L 1 、 L 2 串联，可去掉导线 a
D.
若将导线 M 从接线柱 B 改接到接线柱 A 上，则电路发生短路
【简答题】完形填空。 Tina and Tara are twin sisters. They look 1 , but they also have some differences. Mr. Black is their old grandfather. One day, he came to see his two granddaughters 2 two gifts. When he came in...
【单选题】如图所示的电路中,将开关 S 闭合,灯 L 1 和灯 L 2 均发光,则下列说法中正确的是
A.
灯 L 1 和灯 L 2 并联
B.
灯 L 1 和灯 L 2 串联
C.
通过灯 L 1 和灯 L 2 的电流一定相等
D.
灯 L 1 和灯 L 2 两端的电压一定不相等
【简答题】Mr. Black loved his daughter Helen very much. Every day he spent all of his free time 1 with her. One night, he had much work to do, 2 couldn't play with his daughter. In order to keep her 3 , he foun...
【简答题】Mr. Black loved his daughter very much. Every day he spent all of his free time 1____ with her. One night, he had much work to do , 2____ couldn’t play with his daughter. In order to keep her 3____he...
【简答题】Watch the video clip again and fill in the blanks with the words said by Mr. Jack Black. u06p22.mp4 But we’ve had a number of 1 orders and, according to our forecast, we must bring 2 the shipment if w...
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