隧道式梗丝回潮膨胀设备每班结束时必须冲洗（）。
参考答案：隧道
__________ from heart trouble for years Mr. White has to take some medicine with him wherever he goes.
A．Suffered
B．Suffering
C．Having suffered
D．Being suffered
国有独资企业是一类特殊的有限责任公司。（）
