在化标准型时,需要将不等式约束条件化为等式,在不等式约束条件中增加剩余变量或松弛变量,这些剩余变量或松弛变量在目标函数的系数是 。
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We arrived too late for the concert, just as the musicians were already packing ___ their instruments.
A. up
B. in
C. with
D. on
In extreme sports (such as parachuting), you take the risk that you may wind ____ seriously injured or even dead.
A. in
B. up
C. with
D. on
They hardly scrape____ enough money for the train fare.
A. in
B. with
C. up
D. on
Finding a roof ____ their head has become a real problem for thousands of young people seeking a home of their own.
A. over
B. on
C. in
D. with