管理环境的复杂性，是指组织环境的构成要素的变化不可预见
参考答案：错
This is a _____ map and it didn’t take me much time to come here from the station. [ ]
A. help
B. helpess
C. helpful
D. helping
硅酸盐水泥熟料矿物中最不耐硫酸盐侵蚀的是（）
A、C3A
B、C4AF
C、C3S
D、C2S
