对未成年人犯罪要坚持“教育为主，惩罚为辅”的原则。[ ]
√
—How long may I keep the book?
—You _______ keep it for two weeks. [ ]
A. may
B. must
C. will
钢索上采用瓷瓶吊装绝缘导线布线时，支持点间距不应大于1.5m。线间距离在屋外不应小于50mm。()
