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【单选题】
某碱液25.00 mL,以0.100 0 mo1·L-1 HCl标准溶液滴定至酚酞褪色,用去15.28 mL,再加甲基橙继续滴定,又消耗HCl 6.50 mL,此碱液的组成是( )。
A.
NaOH+NaHCO3
B.
NaOH+Na2CO3
C.
NaHCO3
D.
Na2 CO3
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举一反三
【单选题】The author suggests that finger gestures and rounded rectangles______.
A.
should be granted 'utility patents' instead of 'design patents'
B.
are qualified for 'design patents' but not 'utility patents'
C.
are not terrific enough to tell what 'useful' means
D.
are not non-obvious enough to be granted patents
【单选题】(1) is a method of constructing a project schedule network diagram that uses boxes or rectangles, referred to as nodes, to represent activities and connects them with arrows that show the dependencies...
A.
PDM
B.
CPM
C.
PERT
D.
AOA
【简答题】什么叫黄铜?主加元素锌含量对黄铜的力学性能有何影响?
【判断题】G32指令中的参数R、E是无退刀槽的螺纹切削在斜线退刀时形成的退尾量。
A.
正确
B.
错误
【单选题】The rectangles that are formed when rows and columns intersect are known as.
A.
cells.
B.
merged cells.
C.
split cells.
D.
Tables.
【单选题】(1) is a method of constructing a project schedule network diagram that uses boxes or rectangles, referred to as nodes, to represent activities and connects them with arrows that show the dependencies...
A.
F-S
B.
F-F
C.
S-F
D.
S-S
【简答题】1孔子有言,“知之者不如好之者,好之者不如乐之者”,仿佛以为知、好、乐是三层事,一层深一层;其实在文艺方面,第一难关是知,能知就能好,能好就能乐。知、好、乐三种心理活动融为一体,就是欣赏,而欣赏所凭的就是趣味。许多人在文艺趣味上有欠缺,大半由于在知上有欠缺。 2有些人根本不知,当然不会感到趣味,看到任何好的作品都如蠢牛听琴,不起作用。这是精神上的残废。犯这种毛病的人失去大部分生命的意味。 3有些人...
【判断题】螺纹切削指令G32中的R、E是指螺纹切削的退尾量,一般是以增量方式指定。
A.
正确
B.
错误
【判断题】螺纹切削指令G32中的R、E是指螺纹切削的退尾量,一般是以增量方式指定。( )
A.
正确
B.
错误
【单选题】(1) is a method of constructing a project schedule network diagram that uses boxes or rectangles, referred to as nodes, to represent activities and connects them with arrows that show the dependencies...
A.
F-S
B.
F-F
C.
S-F
D.
S-S
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