生产药品的设备更换时，关键环节是进行
A．设备验证
B．设备检修
C．设备维护、保养
D．设备清洁卫生
E．设备的登记
参考答案：A
I refuse to accept the blame for something _____was someone else's fault.[ ]
A. who
B. that
C. as
D. what
—Tom didn’t go to school this morning, did he?
— .Though he had a bad cold.
A．Yes, he didn’t
B．Yes, he did
C．No, he didn’t
D．No, he did
