下列理化性质对外源化学物毒性有影响的有（）。
A、脂/水分配系数
B、电离度
C、挥发度和蒸汽压
D、分散度
参考答案：A, B, C, D
—How many students are there in your school?
—_______ he students in our school _______ over two thousand. [ ]
A. The number of, is
B. The number of, are
C. A number of, is
某三座厢式运输车其总质量为3300kg，整备质量为1930kg，则其可载货物重量为（）
A.1145kg
B.1175kg
C.1136kg
D.1166kg
