地下商店营业厅不宜设在()
A.首层及以上各层
B.地下一层
C.地下二层
D.地下三层及三层以下
参考答案：D
—He didn't feel a bit nervous when ________.
—No. He'd had a lot of time ________ for it after all.
A．interviewing; to prepare
B．interviewed; to prepare
C．interviewing; preparing
D．being interviewed; preparing
简述负压原油稳定工艺中提高真空度的利弊。
