电磁方向控制阀通常可分为（）
A.直动式
B.自动式
C.手动式
D.先导式
E.旋转式
参考答案：A, D
— The contest is drawing near, and I feel very nervous.
— ______. So long as you try your best, it doesn’t matter whether you win or not.
A．Take your time
B．Take it easy
C．Don’t mention it
D．It’s hard to say
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