我国商标法上规定的防止恶意抢注商标的办法是（）。 A.确立保护使用在先的原则 B

雨天时，我们总是先看到闪电，然后再听见雷声，这是由于______．

从方框里选出合适的语句，填入对话中，使对话通顺、完整。

A:      1    

B:  Hi, Billy.

A:     2    

B: I have been to the shops. Look, I bought this hat.

A:  It's pretty.   3  

B:  No, I didn't.

A:  Where has she gone?

B:     4    . She will be back at about five o'clock.

A:      5     She has been to the park every day this week.

B:  That's because she plays tennis there.

A.  To the park again?

B.  Hello!

C.  Did you go with Jenny?

D.  She has gone to the park.

E.  Where have you been

制备渗透泵型片剂的关键因素有（）.

A.片芯的处方组成

B.包衣膜的厚度

C.包衣膜的通透性

D.释药小孔的大小

E.释放介质的pH

25÷5=（25×______）÷（5×4）

咳喘无力，少气短息，动则益甚，咳痰清稀，语声低怯，舌淡，脉弱者，宜诊为（）

A.肺气虚证

B.肺阴虚证

C.肺气阴两虚证

D.寒痰阻肺证

E.风寒犯肺证