比较微弱而持久的，具有一定渲染性的情绪状态，指的是
A．心境
B．激情
C．挫折
D．应激
E．情感
参考答案：A
Has ____ how many spies we caught during the war ____ up to now?
A．it been declared; have been set free
B．it declared; have been set free
C．they declared; has been set free
D．they declared; have set free
车床进给时，为了防止损坏机床，在接通机动进给时，开合螺母不能合上，反之开合螺母合上时，不允许机动进给，这就是（）。
A、自锁
B、互锁
C、连锁
