冲制一工件,冲裁力为F,采用刚性卸料、下出件方式,则总压力为()
A. 冲裁力+卸料力
B. 冲裁力+推料力
C. 冲裁力+卸料力+推料力
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一根导线,其阻值为R,若将其从中对折成一段新导线,其阻值为()。
A. R
B. R/2
C. R/4
氯丙嗪对体温的影响,表现在低温环境中应用氯丙嗪可使体温显著(),而在高温环境中则可使体温显著()。
Not until this morning()your L/C. We can()make shipment as stipulated in the contract.
A. we receive,not
B. we have received,never
C. did we receive,hardly
D. had we received,certainly