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【单选题】
采用返滴定法测定Al3+的含量时,欲在pH=5.5条件下以某一金属离子的标准溶液返滴定过量的EDTA,此金属离子标准溶液最好选用 ( )
A.
Ca2+
B.
Pb2+
C.
Fe2+
D.
Th(Ⅳ)
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【单选题】Which of the following is NOT mentioned as a reason for the disrupted sleep of travelers?
A.
Crossing different time zones.
B.
Changing light and activity levels.
C.
Working longer hours.
D.
Watching out of the plane for a long time.
【多选题】下列设备可用于蔬菜切碎的有( )。
A.
离心式切片机
B.
盘刀式切碎机
C.
锤片式粉碎机
D.
果蔬 切丁机
【多选题】国民经济调整的“八字方针”包括( )
A.
调整
B.
整顿
C.
巩固
D.
充实
E.
改革
F.
提高
【单选题】When asked why he went there, he said he was sent there _____for a space flight.
A.
training
B.
being trained
C.
to have trained
D.
to be trained
【单选题】以下对贵阳市的描述不正确的是( )
A.
贵阳是国务院确定的“黔中经济区”和“泛珠三角经济区”内的重要中心城市。
B.
贵阳市是全国首个循环经济试点城市。
C.
贵阳市是西南地区重要的交通枢纽
D.
贵阳市是万园之城。
【简答题】以下对 贵阳市 的描述不正确的是( )A. 贵阳 是国务院确定的“黔中经济区”和“泛珠三角经济区”内的重要中心城市 。 B. 贵阳市是全国首个 循环经济试点城市 。 C. 贵阳市西南地区重要的交通枢纽,(  ) D. 贵阳市是万园之城。
【简答题】A.He is not following the recipe. B.He is following the recipe. C.He is missing the right pan to cook the pizza. D.He is using the directions for a different food.
【简答题】Which of the following in NOT mentioned as a reason for the disrupted sleep of travelers?
【单选题】—What happened to Mark yesterday? — He arrived at the station too late, _____ , he missed the early train. [     ]
A.
therefore
B.
however
C.
because
D.
as
【简答题】/'he ɪ tr ɪ d/
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