题目内容

My__friend lives_to the zoo.

A. close; closed
B. closely; closed
C. closed; closely
D. close; close

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You'll have a lot of fun having the meal _________cooking it yourselves.

A. when
B. while
C. during
D. and

My grandma has never been to a big city_______Nanjing.

A. rather than
B. more than
C. other than
D. less than

真空中有一半径为0.3 m的载流半圆环,通过电流为0.14 A,则圆心处磁感应强度大小为:

A. 2.94×10-7 T;
B. 0.25×10-7 T;
C. 0.71×10-7 T;
D. 1.47×10-7 T.

根据磁场的高斯定理判断下面的哪些叙述是正确的?a一根磁感应线可以完全处于闭合曲面内;b一根磁感应线可以终止在闭合曲面内;c穿入闭合曲面的磁感应线条数不等于穿出的磁感应线条数;d穿入闭合曲面的磁感应线条数必然等于穿出的磁感应线条数。

A. ac
B. cd
C. ad
D. ab