【单选题】The yield to maturity for a perpetuity is a useful approximation for the yield to maturity on long-term coupon bonds. It is called the ________ when approximating the yield for a coupon bond.
【判断题】用汞电极在不同无机盐溶液中测得的电毛细曲线的最高点的位置与溶液的成分和种类无关。
【判断题】用汞电极在不同无机盐溶液中测得的电毛细曲线的最高点的位置与溶液的成分和种类无关。( )
【单选题】Typically, yield curves are
A.
gently upward-sloping.
B.
gently downward-sloping.
【单选题】通过插画、图形、图表、表格、关键词等把信息传达出来,将我们的想法画出来,帮助我们有效地分析和理解问题,寻求解决问题的方案,指的是( )
【判断题】在加工表面、切削工具和切削用量(不包括切削深度)不变的条件下所连续完成的那一部分工序称为工步。
【单选题】An investigation that is ____ can occasionally yield new facts, even notable ones; typically the appearance of such facts is the result of a search in a definite direction.
【单选题】Typically, yield curves are ________
A.
gently upward-sloping.
B.
gently downward-sloping.
【单选题】定义一个名为t_cur 的游标,一个名为@t_cur 的游标类型变量,下列语句正确的是( )
B.
fetch next from t_cur into @t_cur
C.
select t_cur into @t_cur
【简答题】差动变压器式传感器理论上讲,衔铁位于中心位置时输出电压为零,而实际上差动变压器输出电压不为零,这个不为零的电压称为______;利用差动变压器测量位移时,如果要求区别位移方向(或正负)可采用______。