焊接热循环
参考答案：
焊接过程中，焊件上的某点的温度随时间变化的曲线称为焊接热循环。
The engineers are so busy that they have zero time for outdoor sports actives, _____ they have the interest. [ ]
A. wherever
B. whenever
C. even if
D. as if
MPC递减意味着（）。
A.消费额减少
B.APS递减
C.APS递增
D.产品滞销的可能性递增
