涂装车间中各种材料的消耗是();()的基础。
参考答案:经济核算、工艺管理
— There’s somebody at the door. Who ______ it be? Is it the postman ?
—No, it ______ be him. It’s just seven o’clock. It’s too early.
A.may, can’t
B.will, won’t
C.may, mustn’t
D.must, may not
一差压变送器测流量,差压为40KPa,量程为200t/h,当流量为80t/h对应的差压值为().
A.4KPa
B.6.25KPa
C.6.4KPa
D.6.5KPa