(2)靠近甲岸的河水流速比靠近乙岸的河水流速快或慢呢?
(A)快
(B)慢
答案:登入後查看
統計: A(7), B(15), C(0), D(0), E(0) #2511212
統計: A(7), B(15), C(0), D(0), E(0) #2511212