We must do ________ work with _______ people.
A:more; less
B:less; less
C:fewer; fewer
D:more; fewer
China is a fantastic place and I have only____ ____ ____ ____ I saw.
关于晶体的熔化和凝固,下列说法正确的是( )
下列实验操作,正确的是( )
赵州桥的主桥拱是圆弧形,它的跨度(弧所对的弦)长为37.4m,拱高(弧的中点到弦的距离)为7.2m,请求出赵州桥的主桥拱半径(结果保留小数点后一位).