【简答题】图样中的图形只能表达零件的 ,零件的真实大小应以图样上所注的 为依据。
【单选题】When a country takes a multilateral approach to free trade, it
A.
removes trade restrictions on its own.
B.
reduces its trade restrictions while other countries do the same.
C.
does not remove trade restrictions no matter what other countries do.
D.
is willing to trade with multiple countries at once.
【单选题】设变量x,y满足约束条件 x-y+2≥0 x-5y+10≤0 x+y-8≤0 ,则目标函数z=3x-4y的最大值和最小值分别为( )
【单选题】设有X与Y的成对数据如下表所示。 表 X与Y取值 X Y X Y X Y 2 106.42 8 109.93 15 110.9 3 108.2 10 110.49 16 110.76 4 109.58 11 110.59 18 111 5 109.5 14 110.6 19 111.2 7 110 试用双曲线Y=a+b/X及对数曲线Y=...
【单选题】用列举法表示集合:方程式3x-5=1的解集正确的是( )
【单选题】跑步时,臀肌收缩是否是推动人体向前的主要动力?
【单选题】When a country takes a unilateral approach to free trade, it
A.
removes trade restrictions on its own.
B.
reduces its trade restrictions while other countries do the same.
C.
does not remove trade restrictions no matter what other countries do.
D.
is willing to trade with multiple countries at once.
【单选题】设x,y满足约束条 3x-y-2≤0 x-y≥0 x≥0,y≥0 若目标函数z=ax+by(a>0,b>0)的最大值1,则 1 a + 1 b 的最小值为( )