氨合成基本工艺步骤不包括（）。
A、气体的压缩和除油
B、气体的预热和合成
C、氨的分离
D、氨的储存
参考答案：D
In the big earthquake all their houses were ______, so they had to build new ones.
A．hurt
B．harmed
C．injured
D．destroyed
临床诊断首先考虑：
A．白化病B．白癜风C．VIND．鳞状上皮增生E．硬化性苔癣
