设备选型应考虑什么问题？
参考答案：
生产率、工艺性、可靠性、维修性、安全性、节能环保性、经济性。
白血病的主要临床表现是（）
A.表情淡漠无欲
B.蝶形红斑
C.面部潮红
D.面色发黄，巩膜黄染
E.面色苍白
After years’ study with the help of Professor Henry Higgins, Eliza was able to________various levels of English usages, such as standard and substandard.
A．indicate
B．differ
C．distinguish
D．mark
