涂尔干认为社会事实是社会学的研究对象,社会事实具有哪几个特点?
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劳动防护用品是用来保护从业人员作业安全和健康的预防性辅助装备。?
A. 正确
B. 错误
什么是电工仪表的准确度,我国常用的电工指示仪表的准确度分几级?
Mother was busy. Although she was not watching the basketball on TV, she()it on the radio.
A. was listening to
B. was hearing
C. was listening
胰腺癌的MRCP表现为胰管呈鼠尾样局限性狭窄,其远侧的胰管明显扩张。
A. 正确
B. 错误