以下属于专业技术人员必须学习和掌握的科学素养的是()科学素养。
A.普遍
B.方法论
C.技术
D.专业
参考答案:B, C, D
I don't want to _______ the topic, but why on earth did you get home that late last night? [ ]
A. take up
B. make up
C. break up
D. bring up
将总体单位按一定标志排队,并按固定距离抽选样本点方法是()
A.类型抽样
B.等距抽样
C.整群抽样
D.纯随机抽样