调节系统的有差调节是指调节前后存在()。
A.负荷偏差;
B.接力器行程偏差;
C.转速偏差;
D.电压偏差
参考答案:C
The teacher_____have thought Johnson was worth it or she wouldn’t have wasted time on him,I suppose.
A.should
B.can
C.would
D.must
兽药原料药标签需注明()。
A.兽药名称
B.生产批号
C.贮藏条件
D.批准文号