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【单选题】
有三只电阻,阻值均为R,若两只电阻串联后再与另一只电阻并联,则总电阻为( )。A.
1/3R
B.
2/3R
C.
3R
D.
2R
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举一反三
【简答题】（ 2006 年石家庄市）某同学想用电流表、电压表测量一段电阻丝 R 的电阻，他已连接了部分电路，如图 20 甲所示。请你接着完成下列步骤： (1) 用笔画线代替导线，将电路补画完整． (2) 当电压表示数为 2.4V 时，电流表的示数如图所示，这时电路中的电流是 A ，电阻丝的电阻为 Ω ．这位同学通过改变被测电阻两端的电压，共测得三组对应的电压值和电流值，最后算出电阻的平均值，这样做的目的是 ...
【单选题】— _____ may I keep these books? —Twice a week. [ ]
A.
How often
B.
How far
C.
How long
D.
How soon
【单选题】_____________ from the bank to the post office? [ ]
A.
How long is it
B.
How far is it
C.
How tall is it
D.
How high is it
【单选题】— may I keep these books? —Two weeks. [ ]
A.
How often
B.
How far
C.
How long
D.
How soon
【判断题】Before considering the following before deciding on attending a trade fair: Is this an international, national, or regional trade fair? Will the product/ service of the company fit in this trade fair?...
A.
正确
B.
错误
【简答题】What is the reason for the popularity of the trade fair? The popularity due to their ______ and save of traveling time.
【单选题】I'll finish the job , no matter ________ it takes.
A.
what
B.
when
C.
how long
D.
how far
【单选题】—How far is it from your home to school, Jimmy? — Not very far. I usually _____ there. It's also a kind of exercise. [ ]
A.
take a train
B.
ride a bike
C.
take a plane
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