公安机关办理行政案件时，拟作出何种行政处罚决定前，应当告知违法嫌疑人有要求举行听证的权利？
相同的投入，下列哪种期权投资策略可能有最大收益（） ["买入看涨期权","卖出看涨期权","买入看跌期权","买出看跌期权"]
A co-worker uses a gadget from the Windows Sidebar feature on their computer. You examine your computer and find that the gadget is not on the list of available gadgets. You need to add this gadget to the Windows Sidebar feature on your computer. What should you do?（） ["A","B","C","D"]
在我国，重大危险源是指长期的或临时的生产、搬运、使用或储存危险物品，且危险物品的数量等于或超过（）的单元。 ["20t","临界量","50t"]
微型计算机访问存储器的速度从快到慢依次为（）。 ["软盘、硬盘、内存","硬盘、软盘、内存","内存、软盘、硬盘","内存、硬盘、软盘"]
简述纺化纤时，化纤容易产生粘卷的原因及解决措施。
