容量为50千瓦以上的电动机及其底座与邻近机器间相距的最小净距是（）米。
参考答案：1
—It’s such a beautiful day. Why not have a picnic with us?
—_____. But I have a lot of homework to do.
A．Don’t mention it
B．It’s up to you
C．I have no time
D．I’d love to
口服补液盐按规定冲后其中含钠液相当于（）
A.1/4张
B.1/5张
C.1/2张
D.2/3张
E.3/4张
