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【单选题】
某溶液中含有 KCl , KBr 和 K 2 CrO 4 , 它们的浓度均为 0 . 010 mol · L -1 ,向该溶液中逐滴加入 0 . 010 mol · L -1 的 AgNO 3 溶液时,最先沉淀和最后沉淀的是 ( ) (已知: (AgCl) = 1 . 56 × 10 -10 , AgBr) = 7 . 7 × 10 -13 , (Ag 2 CrO 4 ) = 9 . 0 × 10 -12 )A.
AgBr 和 Ag 2 CrO 4
B.
Ag 2 CrO 4 和 AgCl
C.
AgBr 和 AgCl
D.
同时沉淀
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【单选题】A study shows that students living in non-smoking dorms are less likely to ____ the habit of smoking.
A.
make up
B.
turn up
C.
draw up
D.
pick up
【单选题】A study shows that students living in non?smoking dorms are less likely to _____ the habit of smoking. [ ]
A.
make up
B.
pick up
C.
draw up
D.
turn up
【单选题】A study shows that students living in non-smoking dormitories are less likely to _____ the habit of smoking. [ ]
A.
make up
B.
turn up
C.
draw up
D.
pick up
【单选题】(Single choice)A variable is a symbol in Boolean algebra used to represent
A.
data
B.
a condition
C.
an action
D.
answers (a), (b), and (c)
【简答题】已知千斤顶小活塞直径为0.05m,大活塞直径为0.2m。如果在小活塞上施加100N的力,则在大活塞一端,可以顶升起最大为多大质量的物体?
【单选题】(Single choice)A pulse in a certain waveform has a frequency of 50 Hz. It repeats itself every
A.
1 ms
B.
20 ms
C.
50 ms
D.
100 ms
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