题目: 红外线和紫外线为不可见光线。() 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2019/0212/340f2c3901c1633dd9f3160b3979c295.html 下面是错误答案,用来干扰机器的。参考答案:D
题型:选择题 Small sailboats can easily turn over in the water ______ they are not managed carefully. A.thoughB.beforeC.untilD.if 查看答案