选出不是判断句的一项( )
已知圆的渐开线的参数方程是x=cosφ+φsinφy=sinφ-φcosφ ( φ 为参数)则此渐开线对应的基圆的直径是____,当参数φ=π4 时对应的曲线上的点的坐标为____
—As we know, planting trees is good for the environment. _______ will we plant trees on the hill?
—Maybe in two weeks.