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【简答题】
用万用表测试晶体管时,选择欧姆档R×10K档位。
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举一反三
【简答题】Say what you want—strong 明确表示自己所需
【多选题】What Should You Buy?
A.
Food looks good if you cut it into small pieces.
B.
Obento boxes are lunch boxes used in Japan.
C.
Mothers make obento boxes for nursery school children.
D.
You'll need to buy a box and things to separate it into sections.
E.
Get some colored napkins, ribbons, and chopsticks.
F.
Use different colors and textures to make an attractive box.
G.
It's important to decorate the box with things from nature.
H.
There are many books you can buy with good ideas.
I.
A divided box is packed with small portions of several foods.
【单选题】在电流元 Idl 激发的磁场中,若在距离电流元为 r 处的磁感应强度为 dB ,下列叙述哪些是正的? ( ) (1)dB 的方向与 r 方向相同 (2)dB 的方向与 Idl 方向相同 (3)dB 的方向垂直于 Idl 与 r 组成的平面 (4)dB 的指向为 Idl 叉乘 r 的方向
A.
(1)(2)
B.
(2)(4)
C.
(1)(3)
D.
(3)(4)
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