各部门HSE工作的主要步骤不包括()
A.识别评估
B.风险控制
C.风险识别
D.绩效评估
参考答案:D
It is believed that the test system,__________ the teachers, ______to blame for the heavy burden
of middle school students nowadays. [ ]
A. other than ; are
B. or rather ; is
C. rather than; is
D. more than; are
聚乙烯的主要测试指标是()。
A.熔融指数
B.密度
C.干点
D.倾点