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单项选择题
实验表明EBT应用于配位滴定中的最适宜的酸度是( )。A、pH<6.3B、pH=9-10.5C、pH>11D、pH=7-11
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问答题
People receive a huge number of emails which are present in the mailboxes every day. To get your email noticed among them, it is important to give your email a ______ that grabs the attention of the receiver.
A、letter-head
B、subject line
C、message
D、closing part
单项选择题
下面那款单片机是国产的()
A.AT89C52
B.STC89C52
C.P89V51
D.PIC17xx
多项选择题
按充装介质的性质,气瓶分为
A、压缩气体气瓶
B、液化气体气瓶
C、溶解气体气瓶
D、非溶解气体气瓶
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