国家建设行政主管门针对建筑施工企业的行业管理特点和当时的形势提出了12项安全生产条件。
参考答案:对
There are many kinds of synthetic materials, ______ plastics are the most common.
A.between which
B.of which
C.in which
D.among which
课程设计,指按照一定的教育观念和价值取向,对学校课程的整体()以及一门课程的各构成()进行的规划与安排。