炭化室的锥度（）。
A.机侧比焦侧宽
B.焦侧比机侧宽
C.机焦一样宽
参考答案：B
--- I want to have the film _________. Can I pick it up tomorrow.
--- No, problem.
A．Developed
B．imagined
C．expanded
D．printed
喷油泵的作用是什么？
