损益表反映了企业在某一时期内的生产成果和经营业绩，反映的是流量变化。
参考答案：对
由于在远场区超声波束会扩散，所以探伤应尽可能在近场区进行。（）
—I hear Jack Chan will come to Laiwu next week.
—Really? ______ he comes, my younger sister will be very happy. [ ]
A．If
B．Until
C．Unless
D．Before
