Micro-irrigation is also known as (). A: A.basin irrigation B: B.infiltrating irrigation C: C.trickle irrigation D: D.spray irrigation

This would enable us to ______ the current crisis and promote economic recovery and growth. A: tackle B: tab C: tickle D: trickle

If you want to make your children laugh you can _____them. ( A: trickle B: pickle C: tickle D: fickle

Exercise helps the blood and other body fluids to _________ in our body. A: nervous B: circulate C: delivery D: reproduction E: trickle

Passage Two Questions 19 to 21 are based on the passage you have just heard. Whatdoesthespeakermainlytalkabout（） A: A new worldwide economic revolution. B: Different forms of assistance to the needy. C: The achievements of the Trickle Up Program. D: The life of poor people in developing countries.

以下关于车辆充电器的使用，正确的是（）。 A: 如果使用外部供电模式，会缩短车辆蓄电池的使用寿命。 B: 当充电器的最大充电时间，或最大充电容量，设置出现问题时，充电器会限制充电电压和电流的输出。 C: 充电器的显示屏上显示“TRICKLE"，代表当前处于涓流状态。 D: 在charge模式充电时，通过恒流，恒压，涓流，3阶段，充满蓄电池。

比较C≡C, C=C, C─C, C=C─C=C的键长次序为: C=C─C=C>C─C> C≡C >C=C|C=C─C=C>C─C>C=C>C≡C|C≡C>C=C>C─C>C=C─C=C|C─C>C=C>C=C─C=C>C≡C|C─C>C=C─C=C>C=C>C≡C

下列哪种主链骨架原子排列最能代表两个肽键?() A: Cα—N—Cα—C—Cα—N—Cα—C B: Cα—N—C—C—N—Cα C: C—N—Cα—Cα—C—N D: Cα—C—N—Cα—C—N E: Cα—Cα—C—N—Cα—Cα—C

比较C≡C(Ⅰ),C=C(Ⅱ),C─C(Ⅲ),C=C─C=C(Ⅳ)的键长次序为( )。 A: Ⅰ＞Ⅱ＞Ⅲ＞Ⅳ B: Ⅲ＞Ⅱ＞Ⅳ＞Ⅰ C: Ⅲ＞Ⅳ＞Ⅱ＞Ⅰ D: Ⅳ＞Ⅲ＞Ⅱ＞Ⅰ

不稳定的一类化合物是: C≡C|C－C|C＝C|C＝C－C＝C|C＝C＝C