每个阴极小框架上的极线应（），松紧程度适宜且在同一个平面内。
A.保持平直；
B.有一定的曲度；
C.错落有致；
D.完好。
参考答案：A
思维能力强的人，语言能力一定也强。（）
Which of the following relationships most accurately describes the inefficiency resulting from government imposed production quotas（）
A. Marginal benefit exceeds marginal cost leading to underproduction.
B. Marginal benefit exceeds marginal cost leading to overproduction.
C. Marginal cost exceeds marginal benefit leading to overproduction.
