舵机伺服控制系统电磁阀弹簧断裂会导致（）。
A.转舵慢
B.滞舵
C.冲舵
D.舵不转
参考答案：C
Tom's mother kept telling him that he should work harder, but ______ didn't help. [ ]
A. he
B. which
C. she
D. it
增设青年就业服务机构是对( )治理的一种方式。
A．摩擦性失业
B．结构性失业
C．周期性失业
D．自愿性失业
