【单选题】By doing the 'tank test', the engineers can find out______.
A.
the amount of air in the plane
B.
the strength of the plane structure
C.
the pressure inside and outside the plane
D.
the power of the airplane engines
【单选题】The engineers have rejected the employers' proposals to end the strike and the other workers have come out in ________. [ ]
【单选题】关于卤代烃的S N 2反应说法,肯定错误的是
【简答题】房地产市场调查人员有时采取在夜间到居住小区测算“亮灯率”的方法来分析入住率,这种调查方法属于( )调查法,其主要优点是()、( )和( ),但是( )不够。A. 观察B. 信息直观可靠C. 实施简便易行D. 过程排除干扰E. 调查深度
【单选题】Should the engineers attend the meeting?
【单选题】市场调查的方法很多,按调查方式划分,有直接调查法和间接调查法。下列不属于直接调查法的是( )。