表达式a*（b+c）-d的后缀表达形式为（）。A．abcd*+- B．abc+*d-

根据句意,补全已给出首字母的单词。

1.---Hello,class! Is everyone p_____ today?

  ---No, Lin Tao is ill so he is a_____.

2.PE lesson stands for p_____ education.

3.F_______(幸运地),we don't have exams in every subject.

4. We have a large sports ground where we play football ,tennis and do a______(田径运动).

5.-Which subject do you like most?

  -B_____ and G______.They are really interesting and useful.

药品的分类和摆放的主要原则为

A．以剂型为主分类

B．以药品的特殊用途分类

C．以药品药理作用分类

D．以药品出厂时间分类

E．以药品有效期分类

牛，呼吸困难，同时体表静脉呈明显的扩张犹如绳索状，可视黏膜发绀，并有树枝状充血，并伴发体躯下部浮肿，脉细数。该病牛呼吸困难属于（）

A、肺原性

B、心原性

C、血原性

D、中毒性

E、中枢性

The lawyer rarely wears anything other than jeans and T-shirt ________ the reason.

A．whatever

B．wherever

C．whenever

D．however

电桥使用完毕后，要将检流计锁扣锁上经防（）。

A、电桥出现误差

B、破坏电桥平衡

C、搬动时振坏检流计

D、电桥的灵敏度降低