直流串励式电动机的转矩,在磁路未饱和时与()。
A.电枢电流成正比
B.电枢电流的平方成正比
C.电枢电流大小无关
参考答案:B
不可零售的药品有
A.麻醉药品
B.罂粟壳
C.一类精神药品
D.放射性药品
E.米非司酮
If Pat bought a tennis shirt with matching shorts, what was the cost of the shirt ?() (1)The total cost of the shirt and shorts was $20. (2)The ratio of the cost of the shirt to the cost of the shorts was 2:3.
A.条件(1)充分,但条件(2)不充分.
B.条件(2)充分,但条件(1)不充分.
C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.
D.条件(1)充分,条件(2)也充分.
E.条件(1)和条件(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.