Although lube oils used in the main lubricating service systems should have a relatively high flash point to avoid ignition, they can create smoke and fire hazards when they ().
A. are exposed to a vacuum
B. come in contact with extremely hot surfaces
C. are reduced in temperature to just above the pour point
D. become extremely agitated or aerated
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铁路货车安全防范系统须满足在不同的地理位置、气候条件下()运行的要求。
人乳能为婴儿提供较多的免疫因子,因此母乳喂养儿的患病率比人工喂养儿低。()
A. 正确
B. 错误
关于存货分类管理描述正确的是()。
A类存货金额大,数量多
B类存货金额一般,品种数量相对较多
C类存货金额小,数量少
D. 三类存货的金额、数量大致为A:B:C=0.7:0.2:0.1
慈善信托的受托人应当每年至少()将信托事务处理情况及财务状况向其备案的民政部门报告,并向社会公开。