煤系顶、底部有强岩溶承压含水层时、()应当布置在不受水威胁的层位中。
A.采取集中上山
B.主要运输巷
C.工作面回风巷
参考答案:B
商店运来大米和面粉各600袋,每袋大米重30千克,每袋面粉重25千克,运来的大米比面粉多多少千克?
找出句子中错误的一项并在横线上改正。
( ) 1. Did you had breakfast in the morning?
A B C
( ) 2. There are the train.
( ) 3. It's about five hundred year old.
( ) 4. I'm puting a film in my camera.
( ) 5. These child are flying kites.