三甘醇循环泵的冷却所使用的热交换器属于（）热交换器。
A、沉浸式蛇管
B、喷淋式蛇管
C、夹套式
D、列管式
参考答案：C
The manager assured the customer that his complaint would be see _______ immediately .
A．at
B．to
C．on
D．with
简述搅拌轴轴径确定的依据。
