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下列关于触变胶的正确叙述为下列关于触变胶的正确叙述为（）

A.触变胶可作助悬剂
B．触变胶属于非牛顿流体
C．触变胶属于牛顿流体
D．塑性流体具有触变性
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Task A 阅读下面的文章，完成第1-5题。 Technology companies usually focus their employee benefits around making people stay in the office longer, ping-pong tables, game rooms, on-site training rooms, some even offer laundry services. We, ABC Company, don’t do any of these. Instead, we focus on benefits that get people out of the office as much as possible. We designed our benefits system to reflect that. Here are some of the benefits we offer to get people away from the computer ●Vacations: For the last three years in a row, we’ve worked with a professional travel agent to prepare different travel packages that employees could pick from as a holiday gift. Everything is paid for and included. Specific, pre-arranged trips — whether for a family to go to Disneyland or a couple to tour Spain — have helped make sure people actually take their vacations. 4-day Summer Weeks: From May through October, everyone who’s been with the company for more than a year gets to work just four days in a week. This started out as “Friday’s off”, but roles like customer support and operations need to cover all hours. To come up with the best ideas, you need a fresh mind. These travel and time-off benefits help everyone stay sharp. 1.The usual focus of employee benefits offered by technology companies is to .
A、keep employees to stay longer in the office
B、encourage employees to work overtime
C、help employees to participate in exercise
D、ensure employees to work energetically
A.The
B.
单项选择题
下列关于絮凝剂与反絮凝剂的正确叙述为下列关于絮凝剂与反絮凝剂的正确叙述为（）
A.在混悬剂中加入适量电解质可使ζ电位适当降低，称电解质为反絮凝剂
B．f电位在20—25mV时混悬剂恰好产生絮凝
C．同一电解质因用量不同，在混悬剂中可以起絮凝作用或起反絮凝作用
D．絮凝剂离子的化合价与浓度对混悬剂的絮凝无影响
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