粗甲胺经（）与原料液进行逆流换热。
A.交换器
B.换热器
C.绝热器
参考答案：B
To our disappointment, it was _____ made him so upset_____ wasn't known by us.[ ]
A. that; that
B. what; that
C. what; who
D. that; who
银行的战略规划始于（）。
A.宏观战略层面
B.中观管理层面
C.微观执行层面
D.都有可能
