()是指在科学研究过程中,为解决课题研究中出现的科学问题、技术难点所使用的研究方法。
A、科学方法
B、科研方法
C、哲学方法
D、一般方法
参考答案:B
Advertisers are increasingly cautious about taking out ads _____ children, and that is hurting children's
magazines. [ ]
A. being aimed at
B. aimed at
C. having aimed at
D. having been aimed at
货物列车技术作业过程