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【单选题】
A company meeting provides an opportunity to ideas and discuss any problems that come up within the workplace.
A.
reach
B.
share
C.
take
D.
lead
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【单选题】---She couldn’t have done that sort of thing ---______ what she did with what you did, I consider her more sensible. Besides, it’s none of your business. Get down to ______ your lessons. [     ]
A.
Comparing; doing
B.
Comparing; do
C.
Compared; doing
D.
Compared; do
【简答题】将下列十进制数转换成二进制数: 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
【简答题】含有Zn2+和Al3+的酸性混合溶液,欲在pH=5~5.5的条件下,用EDTA标准溶液滴定其中的Zn2+。加入一定量六亚甲基四胺的作用是________________________________ ;加入NH。F的作用是________________。。.
【简答题】在含有Ca 2+ ,Mg 2+ 和Zn 2+ 的混合溶液中,欲用EDTA溶液直接滴定Zn 2+ ,为了消除Ca 2+ ,Mg 2+ 的干扰,最简便的方法是()
【简答题】What did Usher and the visitor do when Lady Madeline died?
【简答题】含有Zn 2+ 和Al 3+ 的酸性混合溶液,欲在pH=5~5.5的条件下,用EDTA标准溶液滴定其中的Zn 2+ 。加入一定量六亚甲基四胺的作用是______;加入NH 4 F的作用是______。
【简答题】What did Mr. Usher look like when the visitor first came?
【单选题】---She couldn’t have done that sort of thing. ---______  what she did with what you did, I consider her more sensible. Besides, it’s none of your business. Get down to ______ your lessons.
A.
Compared; doing
B.
Comparing; do
C.
Comparing; doing
D.
Compared; do
【简答题】含有Zn2+和Al3+的酸性缓冲溶液,欲在pH=5~5.5的条件下,用EDTA标准溶液滴定其中的Zn2+,加入一定量六亚甲基四胺的作用是 ;加入NH4F的作用是 。
【简答题】含有Zn2+ 和Al3+ 的溶液,欲在pH=5~5.5的条件下,用EDTA标准溶液滴定其中的Zn2+,测定时会加入一定量六亚甲基四胺,作用是 ;加入NH4F的作用是 。
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