（）是指设备在运行中经受的、可能对设备状态造成不良影响的各种特别工况。
参考答案：不良工况
-Jim should have been informed of the wedding place.
-________but he simply forgot about it.
A．So he had
B．So had he
C．So was he
D．So he was .
质量比太阳小的恒星，最终会演化成（）
A、白矮星
B、中子星
C、脉冲星
D、黑洞
