当敷设的充油电缆放完后,应从()开始或从中间向两端使电缆就位,以免造成电缆过长或过短而需重新摆布。
A.两端;
B.一端;
C.分段同时;
D.两端向中间。
参考答案:B
Between the two parts of the concert is an interval, ___the audience can buy ice-cream.
A.when
B.where
C.that
D.which
何谓磁场的自励和他励?