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【单选题】
如图所示,三个完全相同的球 a 、 b 、 c 位于等边三角形的三个顶点上. a 和 c 带正电, b 带负电, a 所带电荷量的大小比 b 的小.已知 c 受到 a 和 b 的静电力的合力可用图中四条有向线段中的一条来表示,它应是 ( )A.
F 1
B.
F 2
C.
F 3
D.
F 4
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举一反三
【简答题】根据短文内容,从方框中选择适当的词,并用其适当形式填空。 f rom, by, always, big, but, other, home, help, different, wash What do people do in their free time? Some people like to stay at ##1## . Some would like to go for a picni...
【单选题】What reason does the man give for not visiting his parents?
A.
He lives too far away from them.
B.
He doesn't get along with them.
C.
He has been too busy with work.
D.
He doesn't have a car to drive there.
【单选题】Why does the person have to give up leisure hours if he wants to own a private car?
A.
Because he has to spend some time in the car.
B.
Because he has to work extra hours to get the money.
C.
Because he is busy working for his boss.
D.
Because keeping a car in good condition takes a lot of time.
【单选题】Why does the man ride a bike to work?
A.
He thinks subway is too expensive.
B.
His house is not far away from the office.
C.
He wants to keep in a good shape.
D.
His car is being repaired right now.
【简答题】胆囊穴的定位是在小腿外侧上部，当腓骨小头前下方凹陷处直下（ ）
【简答题】根据所听对话及问题，选择正确答案。 ( ) 1. A. In the shop. ( ) 2. A. He can't find his car. ( ) 3. A. Yes, she does. ( ) 4. A. By car. ( ) 5. A. No, he won't. ( ) 6. A. In a bookstore. B. In the...
【单选题】Why didn't Mark get up at his usual time?
A.
Because the repair man borrowed his car.
B.
Because he does not own a car.
C.
Because had to take the bus to work.
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