Small businesses face unique customer challenges, which three challenges are small businesseslooking to overcome?（） [" technical staffing"," data center deployments"," employee training"," cost containment"," operational efficiency"," customer responsivene"]
物流的法律框架中运输部分的法律法规和公约，体系最为不完整，而且比较简单。
电流互感器二次开路有何危害？
单位是度量物理量的基准。（）
下列关于生物转化说法错误的是（） ["生物转化是机体维持稳态的主要机制","外源化合物生物转化酶所催化的反应分Ⅰ相反应和Ⅱ相反应","一般说来，生物转化使外源化合物水溶性增加，毒性降低","以上说法都不对"]
森林群落有哪些基本特征？
