在配制聚合物溶液时对搅拌器有何要求？
参考答案：
①在选择搅拌器时应注意对搅拌器形状和叶片分布的选择；
②运转时叶片外沿线速度应在80r/min以下。
Which of the following statements best describes humor in China
A．It is more or less the same in all parts of the country.
B．It is drastically different in every part of the country.
C．It is distinguished from Hong Kong.
D．It is more a verbal act than a physical act in the north.
B型香料烟K1的颜色规定为（）
A、正黄淡黄
B、浅棕红棕
C、红棕褐色
D、橘黄金黄深黄
