( )是指项目建设资金必须按规定用于经批准的建设项目,不得截留、挤占和挪用。
A.分级管理原则
B.专款专用原则
C.效益原则
D.分级负责原则
参考答案:B
Hillary Clinton arrived in Beijing yesterday, ________the start of her short visit to China. [ ]
A. marked
B. having marked
C. marking
D. to mark
写出求单台电动机熔断丝额定电流的公式。