单项选择题
CRH2动车组采用()控制方法进行列车的驱动控制
A.变频变压矢量
B.仅变压
C.仅变频
D.变频变压标量
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单项选择题
Read the following lead and identify its type: When Lan Weiguang first invested in the northeastern Chinese city of Siping in 2006, he was welcomed by the city mayor with open arms. But 13 years later the scientist-turned-businessman is desperate to get out after his multi-million dollar investment plunged him into a “long nightmare” that led to a prolonged battle with the city authorities, whom he accused of “gross unfairness” and illegal behaviour. A、summary lead B、narrative lead C、staccato lead D、quote lead E、question lead F、contrast lead
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单项选择题
病人张某,男性,20岁,倒开水时不慎溅在脚背上,局部灼痛,皮肤潮红,立即用冷毛巾局部冷敷,其主要作用是 A. 降低神经末梢敏感性、减轻疼痛 B. 使局部血管扩张,血流加速 C. 通过传导使局部散热 D. 防止感染 E. 利于脑组织的恢复
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