硫代乙酰胺法检查重金属时要求的酸碱性条件为( )
A．醋酸盐缓冲溶液 B．磷酸盐缓冲溶液 C．醋酸 D．磷酸 E．氨氯化铵缓冲溶液
参考答案：A
本文恰当地主题词是
A．通知 防灾 安全
B．防灾 安全 通报
C．防灾 安全 通知
D．通报 防灾 安全
Which of the following statements is true according to what you have heard
A．I will eat lunch very quickly.
B．I will have lunch before the meeting.
C．I will eat lunch at the meeting.
D．I will eat lunch while jogging.
