三相交流电源，如按正相序排列时，其排列顺序为（）。A.A、C、B B.C、B、A C

看图完成图文。

    It's Friday afternoon. The English Club 1.          a visitor. His name is Tony White. He's from

the USA. He 2.          in New York.

    Now,the children are 3.         to him. They tell him they are From different 4.         .Wang Bing

and Liu Tao are 5.         . Wang Bing is from Beijing and Liu Tao is from Shanghai. Nancy and

6.         brother, David are British. They are from 7._____. They can speak 8.         and Chinese.  

Ben is from the USA, too.  He doesn't speak Chinese.  He 9.         English and French.

Mr White tells the children he likes Shanghai and he 10.         to visit it one day.

尿瘘常采用的检查方法（）

A.亚甲蓝试验

B.B超检查

C.分段诊断性刮宫

D.腹腔镜检查

E.宫颈刮片细胞学检查

对作物施肥原则的表述，以下正确的是（）

A、有机肥料和化学肥料配合施用

B、氮肥、磷肥、钾肥配合施用

C、大量元素和微量元素配合施用

D、氮肥深施、磷肥集中施、钾肥作底肥一次性施，微量元素肥料根外追施

（）是比较被保护线路两侧工频电流相位的高频保护；当两侧故障电流相位相同时保护被闭锁，两侧电流相位相反时保护动作跳闸

A.相差高频保护

B.方向高频保护

C.高频闭锁距离保护

D.高频允许距离保护

根据列车车次判断列车种类，Y301次是（）旅客列车。

A.跨局快速

B.普快

C.普慢

D.旅游