—Is Tom at home? —No, he ______ to town.

21. The winning of hosting _______ 2010 World Expo is _______ victory not only for Shanghai residents, but for ___________ people of the whole Chinese nation.

A．the; a; the

B．a; the; a

C．a; a; the

D．the; the; a

稳定肥大细胞膜防止过敏递质释放的平喘药是：

A．异丙肾上腺素
B．异丙托溴胺
C．倍氯米松
D．色甘酸钠
E．沙丁胺醇

中国1.2万吨水压机是在哪一年制造成功的？

直流电动机是否允许低速运行？

职工层面执行无力的表现是什么？。