题型:填空题 —I rang you at about nine,but there was no reply.—Oh,that was probably I was seeing the doctor.A.whyB.whenC.what D.that 查看答案
题型:填空题 下列数据,符合实际的是( )A.物理课本中一张纸的厚度约为1mmB.光在空气中的传播速度约为340m/sC.将一个面积为5cm2的吸盘从光滑的玻璃面上拉下所用的拉力约为50ND.初中学生的体重一般为50N左右 查看答案