【单选题】天线的几何中心与相位中心之间的距离是( )。
【单选题】低碳钢的σ-ε曲线如图所示,应力加至k点,然后逐渐卸载时,相应的σ-ε关系为 。
【单选题】Apprenticeships can bring many benefits to small companies EXCEPT
A.
any kind of companies to be more competitive.
B.
saving the wages paid to those employees as apprentices.
C.
enabling the specialists in companies to develop their skills.
D.
keeping the expensive external recruitment to a minimum.
【单选题】Excuse me for______you with such a small matter.
【单选题】A small percentage of girls up the computer science classes would be ______.