制冷剂经分流器（花洒头）使制冷剂平均输入哪一项装置（）
A.蒸发器
B.冷凝器
C.压缩机
D.以上皆非
参考答案：A
钢筋接头配置在同—截面的允许百分率，焊接接头在受弯构件的受拉区不超过( )。
A．30% B．40%C．50% D．80%
It is reported that the latest outbreak of the bird flu in Pennsylvania in the United States has prompted China to slap a ban on poultry imports from the state.()
A. marine products
B. dairy products
C. industrial products
D. avian products
