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举一反三
【单选题】Passage 3 Questions 11 to 15 are based on the following passage: Scientists in India have invented a new way to produce electricity. Their invention does not get its power from oil, coal or other fuel...
A.
Because bullocks have long been used by Indian people
B.
Because bullocks walk slowly and are easy to control.
C.
Because there are few non-working bullocks in India
D.
Because there is not enough oil in India.
【单选题】下图是 298K 和标准压力情况下 , A(H 2 O), B(NH 4 Cl) 和 C(NH 4 NO 3 ) 三组分系统的相图 . 以下描述中错误的是
A.
DF 线段是 NH 4 Cl 的饱和溶解度曲线
B.
F 点物系中的 NH 4 Cl 和 NH 4 NO 3 均在水中达到饱和
C.
P 点物系加水进 CEF 区后 , 过滤可得纯的 NH 4 NO 3 固体
D.
4 区是 NH 4 Cl 固体 , NH 4 NO 3 固体以及水溶液的三相平衡区
E.
物系 G 加水后 , 当物系点为 O 2 时过滤得到的 NH 4 Cl 固体量比物系点为 O 1 时多