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【单选题】
Z10-01-06．两条无限长载流导线，间距0.5厘米，电流10A，电流方向相同，在两导线间距中点处磁场强度大小为：A.
0
B.
C.
D.
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皮皮学刷刷变学霸
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【简答题】下列属于损益类科目的是（ ）。
【单选题】You must use heaters very carefully as they can easily ______ objects on fire if you are careless. [ ]
A.
make
B.
set
C.
take
D.
let
【单选题】You ______ use your mobile on the plane, but you ______ listen to music. [ ]
A.
must not; can
B.
cannot ; must
C.
must not; must
D.
can; cannot
【单选题】If you use your Telecard to make a local call you must ______.
A.
pay salary
B.
pay extra
C.
use a card phone