对于负值客户企业应该进行战略性的放弃，之所以是战略性放弃，是因为()。A．改变最有价

Students ______ to school on weekends. They can relax themselves at home.    [ ]

A. doesn't need going

B. need to go  

C. don't need to go

D. needs to go

–I don’t know what I _______ without the suitcase you lent me.

–Glad to have been of some help to you.

A．should have done

B．would do

C．would have done

D．should do

男性，25岁。慢性哮喘长期吸入表面激素，病情显著改善，但在季节转换或感冒时仍时有发作（）。

A.表面激素吸入

B.β受体激动剂吸入

C.口服泼尼松，短期（1周左右）使用

D.口服茶碱控释片

E.静脉滴注氢化可的松、吸入β受体激动剂

F.异丙托溴铵（异丙托品）吸入

G.皮下注射肾上腺素

简述会展的功能。

铝属于（）金属。

A.黑色

B.有色

C.合金

D.合成